diff --git a/frontend/src/app/AppLayout.jsx b/frontend/src/app/AppLayout.jsx
index 43b3556..2b28eff 100644
--- a/frontend/src/app/AppLayout.jsx
+++ b/frontend/src/app/AppLayout.jsx
@@ -27,6 +27,10 @@ import { isTagTransferEvent } from '../documents/tagTransfer';
 const ASSET_PRESIGN_TTL_MS = 240 * 1000; // backend issues 5 min tokens; refresh slightly early
 
 const DEFAULT_FOLDER_NAME = 'Documents';
+const DEFAULT_SORT_FIELD = 'title';
+const DEFAULT_SORT_DIRECTION = 'asc';
+const SORT_FIELD_VALUES = ['title', 'issued_at', 'created_at', 'updated_at'];
+const TAG_FILTER_UNTAGGED = '__UNTAGGED__';
 
 const ROW_KEY_SEPARATOR = ':';
 const DOCUMENT_ROW_PREFIX = 'document';
@@ -204,6 +208,46 @@ const AppLayout = () => {
       return 'list';
     }
   });
+  const [documentsSortField, setDocumentsSortField] = useState(() => {
+    if (typeof window === 'undefined') {
+      return DEFAULT_SORT_FIELD;
+    }
+    try {
+      const stored = window.sessionStorage.getItem('papercrate_sort_field');
+      return SORT_FIELD_VALUES.includes(stored) ? stored : DEFAULT_SORT_FIELD;
+    } catch (error) {
+      console.warn('[sort] failed to read stored sort field', error);
+      return DEFAULT_SORT_FIELD;
+    }
+  });
+  const [documentsSortDirection, setDocumentsSortDirection] = useState(() => {
+    if (typeof window === 'undefined') {
+      return DEFAULT_SORT_DIRECTION;
+    }
+    try {
+      const stored = window.sessionStorage.getItem('papercrate_sort_direction');
+      return stored === 'desc' || stored === 'asc' ? stored : DEFAULT_SORT_DIRECTION;
+    } catch (error) {
+      console.warn('[sort] failed to read stored sort direction', error);
+      return DEFAULT_SORT_DIRECTION;
+    }
+  });
+  const documentsSortFieldRef = useRef(DEFAULT_SORT_FIELD);
+  const documentsSortDirectionRef = useRef(DEFAULT_SORT_DIRECTION);
+  const [searchIncludeDescendants, setSearchIncludeDescendants] = useState(() => {
+    if (typeof window === 'undefined') {
+      return true;
+    }
+    try {
+      const stored = window.sessionStorage.getItem('papercrate_include_descendants');
+      if (stored === 'true') return true;
+      if (stored === 'false') return false;
+    } catch (error) {
+      console.warn('[search] failed to read include_descendants preference', error);
+    }
+    return true;
+  });
+  const sortRefreshReadyRef = useRef(false);
   const [deskHelpOpen, setDeskHelpOpen] = useState(false);
   const lastNonDeskViewRef = useRef(documentsViewMode === 'desk' ? 'list' : documentsViewMode);
 
@@ -218,6 +262,42 @@ const AppLayout = () => {
       setDeskHelpOpen(false);
     }
   }, [documentsViewMode, deskHelpOpen]);
+  useEffect(() => {
+    documentsSortFieldRef.current = documentsSortField;
+    if (typeof window !== 'undefined') {
+      try {
+        window.sessionStorage.setItem('papercrate_sort_field', documentsSortField);
+      } catch (error) {
+        console.warn('[sort] failed to persist sort field', error);
+      }
+    }
+  }, [documentsSortField, documentsSortFieldRef]);
+
+  useEffect(() => {
+    documentsSortDirectionRef.current = documentsSortDirection;
+    if (typeof window !== 'undefined') {
+      try {
+        window.sessionStorage.setItem('papercrate_sort_direction', documentsSortDirection);
+      } catch (error) {
+        console.warn('[sort] failed to persist sort direction', error);
+      }
+    }
+  }, [documentsSortDirection, documentsSortDirectionRef]);
+
+  useEffect(() => {
+    if (typeof window === 'undefined') {
+      return;
+    }
+    try {
+      window.sessionStorage.setItem(
+        'papercrate_include_descendants',
+        searchIncludeDescendants ? 'true' : 'false',
+      );
+    } catch (error) {
+      console.warn('[search] failed to persist include_descendants preference', error);
+    }
+  }, [searchIncludeDescendants]);
+
   const tokenRef = useRef(token);
   const refreshPromiseRef = useRef(null);
   const breadcrumbFetchRef = useRef(new Set());
@@ -281,11 +361,16 @@ const AppLayout = () => {
   );
   const toggleTagFilter = useCallback((tagId) => {
     if (!tagId) return;
-    setActiveTagFilters((previous) =>
-      previous.includes(tagId)
-        ? previous.filter((id) => id !== tagId)
-        : previous.concat([tagId]),
-    );
+    setActiveTagFilters((previous) => {
+      if (tagId === TAG_FILTER_UNTAGGED) {
+        return previous.includes(TAG_FILTER_UNTAGGED) ? [] : [TAG_FILTER_UNTAGGED];
+      }
+      const sanitized = previous.filter((id) => id !== TAG_FILTER_UNTAGGED);
+      if (sanitized.includes(tagId)) {
+        return sanitized.filter((id) => id !== tagId);
+      }
+      return sanitized.concat([tagId]);
+    });
   }, []);
 
   const toggleCorrespondentFilter = useCallback((correspondentId) => {
@@ -297,6 +382,19 @@ const AppLayout = () => {
     });
   }, []);
 
+  const handleDocumentsSortFieldChange = useCallback((field) => {
+    const nextField = SORT_FIELD_VALUES.includes(field) ? field : DEFAULT_SORT_FIELD;
+    setDocumentsSortField((previous) => (previous === nextField ? previous : nextField));
+  }, []);
+
+  const handleDocumentsSortDirectionToggle = useCallback(() => {
+    setDocumentsSortDirection((previous) => (previous === 'asc' ? 'desc' : 'asc'));
+  }, []);
+
+  const toggleSearchIncludeDescendants = useCallback(() => {
+    setSearchIncludeDescendants((previous) => !previous);
+  }, []);
+
   const initialRefreshAttemptedRef = useRef(Boolean(token));
 
   useEffect(() => {
@@ -312,6 +410,7 @@ const AppLayout = () => {
     setActiveTagFilters([]);
     setActiveCorrespondentFilters([]);
     setSearchLoading(false);
+    setSearchIncludeDescendants(true);
   }, []);
 
   const handleSearchChange = useCallback((value) => {
@@ -982,13 +1081,32 @@ const AppLayout = () => {
   const ensureFolderData = useCallback(
     async (
       folderId,
-      { force = false, includeDocuments = true, prefetchDepth = 0 } = {},
+      {
+        force = false,
+        includeDocuments = true,
+        prefetchDepth = 0,
+        sortField: overrideSortField,
+        sortDirection: overrideSortDirection,
+      } = {},
     ) => {
       const requestTenantId = tenantIdRef.current;
       const cached = folderContents.get(folderId);
+      const cachedSortField = cached?.__sortField ?? DEFAULT_SORT_FIELD;
+      const cachedSortDirection = cached?.__sortDirection ?? DEFAULT_SORT_DIRECTION;
+      const sortField = includeDocuments
+        ? overrideSortField || documentsSortFieldRef.current || DEFAULT_SORT_FIELD
+        : null;
+      const sortDirection = includeDocuments
+        ? overrideSortDirection || documentsSortDirectionRef.current || DEFAULT_SORT_DIRECTION
+        : null;
+      const cachedSortMatches =
+        !includeDocuments
+        || !cached
+        || (cachedSortField === sortField && cachedSortDirection === sortDirection);
+
       if (!force && cached) {
         const includesDocuments = Boolean(cached.__includesDocuments);
-        if (!includeDocuments || includesDocuments) {
+        if (!includeDocuments || (includesDocuments && cachedSortMatches)) {
           if (prefetchDepth > 0) {
             const subfolders = Array.isArray(cached.subfolders) ? cached.subfolders : [];
             await Promise.allSettled(
@@ -1006,18 +1124,28 @@ const AppLayout = () => {
       }
 
       const path = folderId === 'root' ? 'root' : folderId;
-      const params = includeDocuments
-        ? undefined
-        : { include_documents: false };
-      const { data } = await api.get(`/folders/${path}/contents`, {
-        params,
-      });
+      const params = {};
+      if (!includeDocuments) {
+        params.include_documents = false;
+      } else {
+        params.sort = sortField;
+        params.dir = sortDirection;
+      }
+      const requestConfig = Object.keys(params).length ? { params } : {};
+      const { data } = await api.get(`/folders/${path}/contents`, requestConfig);
       const hydrated = assetManager.hydrateFolderContents(data);
       const childFolders = Array.isArray(data.subfolders) ? data.subfolders : [];
       const childIds = childFolders.map((child) => child.id);
 
+      const enriched = {
+        ...hydrated,
+        __includesDocuments: includeDocuments,
+        __sortField: includeDocuments ? sortField : cachedSortField,
+        __sortDirection: includeDocuments ? sortDirection : cachedSortDirection,
+      };
+
       if (tenantIdRef.current !== requestTenantId) {
-        return { ...hydrated, __includesDocuments: includeDocuments };
+        return enriched;
       }
 
       setFolderNodes((prev) => {
@@ -1089,11 +1217,6 @@ const AppLayout = () => {
         );
       }
 
-      const enriched = {
-        ...hydrated,
-        __includesDocuments: includeDocuments,
-      };
-
       if (includeDocuments) {
         setFolderContents((prev) => {
           if (tenantIdRef.current !== requestTenantId) {
@@ -1118,6 +1241,8 @@ const AppLayout = () => {
                 ? existingEntry.documents
                 : hydrated.documents,
               __includesDocuments: existingEntry.__includesDocuments || false,
+              __sortField: existingEntry.__sortField ?? enriched.__sortField,
+              __sortDirection: existingEntry.__sortDirection ?? enriched.__sortDirection,
             });
           } else {
             next.set(folderId, enriched);
@@ -1128,7 +1253,7 @@ const AppLayout = () => {
 
       return enriched;
     },
-    [assetManager, folderContents],
+    [assetManager, documentsSortDirectionRef, documentsSortFieldRef, folderContents],
   );
 
   const isInvalidFolderDrop = useCallback(
@@ -1461,6 +1586,22 @@ const AppLayout = () => {
     }
   }, [selectedFolder, ensureFolderData, applySelectedFolder, notifyApiError]);
 
+  useEffect(() => {
+    if (!sortRefreshReadyRef.current) {
+      sortRefreshReadyRef.current = true;
+      return;
+    }
+    if (!isFilterActive && token) {
+      refreshCurrentFolder();
+    }
+  }, [
+    documentsSortField,
+    documentsSortDirection,
+    isFilterActive,
+    refreshCurrentFolder,
+    token,
+  ]);
+
   const handleDocumentCorrespondentAttach = useCallback(
     async ({ documentId, correspondentId }, { notify = true, refresh = true } = {}) => {
       if (!documentId || !correspondentId) {
@@ -3719,7 +3860,16 @@ const AppLayout = () => {
           params.query = trimmedQuery;
         }
         if (activeTagFilters.length) {
-          params.tags = activeTagFilters.join(',');
+          const onlyUntagged = activeTagFilters.length === 1
+            && activeTagFilters[0] === TAG_FILTER_UNTAGGED;
+          if (onlyUntagged) {
+            params.tags = 'none';
+          } else {
+            const tagIds = activeTagFilters.filter((id) => id !== TAG_FILTER_UNTAGGED);
+            if (tagIds.length) {
+              params.tags = tagIds.join(',');
+            }
+          }
         }
         if (activeCorrespondentFilters.length) {
           params.correspondents = activeCorrespondentFilters.join(',');
@@ -3728,6 +3878,15 @@ const AppLayout = () => {
         if (folderIdentifier) {
           params.folder_id = folderIdentifier;
         }
+        if (!searchIncludeDescendants) {
+          params.include_descendants = false;
+        }
+        if (documentsSortField) {
+          params.sort = documentsSortField;
+        }
+        if (documentsSortDirection) {
+          params.dir = documentsSortDirection;
+        }
         const { data } = await api.get('/documents', { params });
         if (cancelled) return;
 
@@ -3803,6 +3962,9 @@ const AppLayout = () => {
     searchQuery,
     activeTagFilters,
     activeCorrespondentFilters,
+    searchIncludeDescendants,
+    documentsSortField,
+    documentsSortDirection,
     selectedFolder,
     notifyApiError,
     assetManager,
@@ -4561,6 +4723,12 @@ const AppLayout = () => {
       onCorrespondentClick: toggleCorrespondentFilter,
       onDocumentTagDrop: handleDocumentTagDrop,
       viewMode: documentsViewMode,
+      sortField: documentsSortField,
+      sortDirection: documentsSortDirection,
+      onSortFieldChange: handleDocumentsSortFieldChange,
+      onSortDirectionToggle: handleDocumentsSortDirectionToggle,
+      searchIncludeDescendants,
+      onToggleSearchIncludeDescendants: toggleSearchIncludeDescendants,
       onViewModeChange: handleDocumentsViewModeChange,
       onClearSelection: clearDocumentSelection,
       onDeleteSelection: handleDeleteSelection,
@@ -4586,6 +4754,8 @@ const AppLayout = () => {
       currentSubfolders,
       documents,
       documentsViewMode,
+      documentsSortField,
+      documentsSortDirection,
       draggedDocumentIds,
       draggedFolderId,
       focusedRowKey,
@@ -4595,6 +4765,8 @@ const AppLayout = () => {
       handleDocumentTagDrop,
       handleDocumentTitleUpdate,
       handleDocumentsViewModeChange,
+      handleDocumentsSortFieldChange,
+      handleDocumentsSortDirectionToggle,
       handleFolderDragEnd,
       handleFolderDragStart,
       handleFolderRename,
@@ -4607,6 +4779,7 @@ const AppLayout = () => {
       refreshCurrentFolder,
       searchLoading,
       searchResults,
+      searchIncludeDescendants,
       selectFolder,
       selectedDocumentIds,
       selectedEntries,
@@ -4627,6 +4800,7 @@ const AppLayout = () => {
       handleBulkSelectionReanalyze,
       folderOptions,
       moveDocumentsToFolder,
+      toggleSearchIncludeDescendants,
     ],
   );
 
@@ -4647,6 +4821,7 @@ const AppLayout = () => {
       onCreateFolder: handlePromptCreateFolder,
       creatingFolder,
       tags,
+      untaggedFilterId: TAG_FILTER_UNTAGGED,
       activeTagIds: activeTagFilters,
       onToggleTagFilter: toggleTagFilter,
       onCreateTag: (label) => handleTagCreate({ label }),
diff --git a/frontend/src/documents/DocumentsPanel.jsx b/frontend/src/documents/DocumentsPanel.jsx
index dc3965c..9e1d759 100644
--- a/frontend/src/documents/DocumentsPanel.jsx
+++ b/frontend/src/documents/DocumentsPanel.jsx
@@ -6,7 +6,12 @@ import {
   RefreshIcon,
   MinusVerticalIcon,
   InfoIcon,
+  FoldersIcon,
+  FoldersOffIcon,
+  SortAscendingLettersIcon,
+  SortDescendingLettersIcon,
 } from '../ui/icons';
+import QuickAddMenu from '../ui/QuickAddMenu';
 import BreadcrumbTrail from '../ui/BreadcrumbTrail';
 import createWorkspaceSurfaceConfig from './workspaceHeader';
 import DetailPanel from '../detail/DetailPanel';
@@ -25,6 +30,19 @@ const EntryType = {
   document: 'document',
 };
 
+const SORT_OPTIONS = [
+  { value: 'title', label: 'Title' },
+  { value: 'issued_at', label: 'Issued date' },
+  { value: 'created_at', label: 'Added' },
+  { value: 'updated_at', label: 'Updated date' },
+];
+
+const SORT_LABEL_LOOKUP = SORT_OPTIONS.reduce((accumulator, option) => {
+  const next = accumulator;
+  next[option.value] = option.label;
+  return next;
+}, {});
+
 const DocumentsPanel = ({
   currentFolderName,
   breadcrumbs,
@@ -545,7 +563,6 @@ const DocumentsPanel = ({
   const showDefaultEmptyState = !showingSearchResults && !isFilterActive && entries.length === 0;
   const showListSearchEmptyState = showingSearchResults && !hasDocumentEntries && !isGridView && !isSearchLoading;
   const showGridSearchEmptyState = isGridView && showingSearchResults && !hasDocumentEntries && !isSearchLoading;
-  const showSearchHint = showingSearchResults && rows.length > 0;
   const breadcrumbEntries = useMemo(() => (Array.isArray(breadcrumbs) ? breadcrumbs.filter(Boolean) : []), [breadcrumbs]);
   const trailEntries = useMemo(() => {
     if (!breadcrumbEntries.length) {
@@ -724,11 +741,6 @@ const DocumentsPanel = ({
               />
             )}
           </div>
-          {showSearchHint && (
-            <div className="search-hint">
-              Showing {rows.length} document{rows.length === 1 ? '' : 's'} in {currentFolderName} and subfolders.
-            </div>
-          )}
         </div>
       )}
     </section>
@@ -743,16 +755,115 @@ const DocumentsPanel = ({
 
 export default DocumentsPanel;
 
+const SortFieldQuickMenu = ({ sortField, onChange }) => {
+  const currentOption = useMemo(
+    () => SORT_OPTIONS.find((option) => option.value === sortField) || SORT_OPTIONS[0],
+    [sortField],
+  );
+
+  const options = useMemo(
+    () => SORT_OPTIONS.map((option) => ({ id: option.value, label: option.label })),
+    [],
+  );
+
+  const handleSelect = useCallback(
+    (value, option) => {
+      if (typeof onChange !== 'function') {
+        return;
+      }
+      const nextValue = option?.id || option?.original?.id || value;
+      if (nextValue) {
+        onChange(nextValue);
+      }
+    },
+    [onChange],
+  );
+
+  const label = currentOption?.label || SORT_LABEL_LOOKUP[currentOption?.value] || 'Title';
+
+  return (
+    <QuickAddMenu
+      className="documents-sort__quickmenu"
+      options={options}
+      onSelectOption={handleSelect}
+      triggerClassName="view-toggle__button documents-sort__trigger quick-add__trigger"
+      triggerContent={(
+        <span className="documents-sort__trigger-content">
+          <span className="documents-sort__label">{label}</span>
+        </span>
+      )}
+      triggerAriaLabel={`Sort by ${label}`}
+      triggerTitle={`Sort by ${label}`}
+      placeholder="Select sort field"
+      menuMinWidth={200}
+      align="start"
+      positionStrategy="absolute"
+    />
+  );
+};
+
 export const createDocumentsTableHeaderActions = ({
   viewMode,
   onViewModeChange,
   onRefresh,
   onShowDeskHelp = null,
+  sortField = 'title',
+  onSortFieldChange = null,
+  sortDirection = 'asc',
+  onSortDirectionToggle = null,
+  isFilterActive = false,
+  includeDescendants = true,
+  onToggleIncludeDescendants = null,
 }) => {
   const isListView = viewMode === 'list';
   const isGridView = viewMode === 'grid';
   const isDeskView = viewMode === 'desk';
 
+  const sortDirectionIsDesc = sortDirection === 'desc';
+  const sortDirectionTitle = sortDirectionIsDesc
+    ? 'Sorting Z → A. Click to switch to ascending.'
+    : 'Sorting A → Z. Click to switch to descending.';
+  const includeDescendantsToggle = isFilterActive && typeof onToggleIncludeDescendants === 'function'
+    ? (
+        <button
+          type="button"
+          className="icon-button documents-toolbar__toggle"
+          onClick={onToggleIncludeDescendants}
+          aria-pressed={!includeDescendants}
+          aria-label={includeDescendants ? 'Include subfolders' : 'Limit to current folder'}
+          title={includeDescendants
+            ? 'Including subfolders. Click to limit the search to the current folder.'
+            : 'Limiting to the current folder. Click to include subfolders again.'}
+        >
+          {includeDescendants ? <FoldersIcon /> : <FoldersOffIcon />}
+        </button>
+      )
+    : null;
+
+  const sortControls = typeof onSortFieldChange === 'function'
+    ? (
+        <div className="documents-actions__sort-group">
+          <SortFieldQuickMenu sortField={sortField} onChange={onSortFieldChange} />
+          {typeof onSortDirectionToggle === 'function' ? (
+            <button
+              type="button"
+              className="icon-button documents-toolbar__toggle documents-sort__direction"
+              onClick={onSortDirectionToggle}
+              aria-pressed={sortDirectionIsDesc}
+              aria-label={sortDirectionIsDesc ? 'Sort descending' : 'Sort ascending'}
+              title={sortDirectionTitle}
+            >
+              {sortDirectionIsDesc ? (
+                <SortDescendingLettersIcon size={18} />
+              ) : (
+                <SortAscendingLettersIcon size={18} />
+              )}
+            </button>
+          ) : null}
+        </div>
+      )
+    : null;
+
   return (
     <>
       {isDeskView && typeof onShowDeskHelp === 'function' ? (
@@ -771,6 +882,22 @@ export const createDocumentsTableHeaderActions = ({
           </span>
         </>
       ) : null}
+      {includeDescendantsToggle ? (
+        <>
+          {includeDescendantsToggle}
+          <span className="main-content__actions-divider" aria-hidden="true">
+            <MinusVerticalIcon />
+          </span>
+        </>
+      ) : null}
+      {sortControls ? (
+        <>
+          {sortControls}
+          <span className="main-content__actions-divider" aria-hidden="true">
+            <MinusVerticalIcon />
+          </span>
+        </>
+      ) : null}
       <div className="view-toggle" role="group" aria-label="Change view">
         <button
           type="button"
@@ -828,9 +955,14 @@ export const createDocumentsSurface = ({
     currentFolderName,
     breadcrumbs,
     searchResults,
+    isFilterActive,
     viewMode,
     onViewModeChange,
     onRefresh,
+    sortField,
+    sortDirection,
+    onSortFieldChange,
+    onSortDirectionToggle,
     selectedDocumentIds,
     selectedFolderIds,
     onDeleteSelection,
@@ -846,6 +978,8 @@ export const createDocumentsSurface = ({
     onBulkReanalyze,
     folderOptions,
     onMoveDocumentsToFolder,
+    searchIncludeDescendants,
+    onToggleSearchIncludeDescendants,
   } = tableProps;
 
   const title = Array.isArray(searchResults) ? 'Search results' : currentFolderName;
@@ -862,6 +996,13 @@ export const createDocumentsSurface = ({
     viewMode,
     onViewModeChange,
     onRefresh,
+    sortField,
+    onSortFieldChange,
+    sortDirection,
+    onSortDirectionToggle,
+    isFilterActive,
+    includeDescendants: searchIncludeDescendants,
+    onToggleIncludeDescendants: onToggleSearchIncludeDescendants,
   });
 
   const floatingActions = selectionCount > 0
diff --git a/frontend/src/sidebar/Sidebar.jsx b/frontend/src/sidebar/Sidebar.jsx
index 62037bc..ac576af 100644
--- a/frontend/src/sidebar/Sidebar.jsx
+++ b/frontend/src/sidebar/Sidebar.jsx
@@ -165,6 +165,7 @@ const Sidebar = ({
   onCreateFolder,
   creatingFolder = false,
   tags = [],
+  untaggedFilterId = null,
   activeTagIds = [],
   onToggleTagFilter,
   correspondents = [],
@@ -215,6 +216,7 @@ const Sidebar = ({
   );
   const handleToggleTag = onToggleTagFilter || (() => {});
   const activeTagSet = new Set(activeTagIds);
+  const untaggedActive = untaggedFilterId ? activeTagSet.has(untaggedFilterId) : false;
   const handleManageTags = onManageTags || (() => {});
   const handleManageCorrespondents = onManageCorrespondents || (() => {});
   const handleCreateTag = useCallback(async () => {
@@ -619,6 +621,20 @@ const Sidebar = ({
             }`}
             role="list"
           >
+            {untaggedFilterId ? (
+              <button
+                type="button"
+                role="listitem"
+                className={`sidebar-tag-pill sidebar-tag-pill--untagged${
+                  untaggedActive ? ' active' : ''
+                }`}
+                onClick={() => handleToggleTag(untaggedFilterId)}
+                aria-pressed={untaggedActive}
+                draggable={false}
+              >
+                No tag assigned
+              </button>
+            ) : null}
             {tags.map((tag) => {
               const isActive = activeTagSet.has(tag.id);
               const style = getTagColorStyle(tag.color);
diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index cd6fc7e..66e166c 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -396,7 +396,7 @@ button.danger:hover:not([disabled]) {
 .panel-header button,
 .panel-header a.icon-button {
   display: inline-flex;
-  align-items: flex-start;
+  align-items: center;
   justify-content: flex-start;
   border: none;
   background: transparent;
@@ -631,6 +631,80 @@ button.danger:hover:not([disabled]) {
   height: 1.4rem;
 }
 
+.documents-actions__sort-group {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.35rem;
+}
+
+.documents-sort {
+  display: inline-flex;
+  align-items: center;
+  position: relative;
+}
+
+.documents-sort__trigger {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.35rem;
+  font-size: 0.85rem;
+  white-space: nowrap;
+  padding: 0.25rem 0.5rem;
+  min-height: 2.1rem;
+}
+
+.documents-sort__label {
+  display: inline-flex;
+  align-items: center;
+  line-height: 1.1;
+}
+
+.documents-sort__trigger-content {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.35rem;
+}
+
+.documents-sort__quickmenu .menu__item,
+.documents-sort__quickmenu .menu__item.active {
+  font-weight: 400;
+}
+
+.documents-toolbar__toggle {
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  padding: 0.3rem;
+  background: transparent;
+  color: var(--muted);
+  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
+}
+
+.documents-toolbar__toggle:hover:not([disabled]) {
+  color: var(--fg);
+  border-color: var(--border);
+}
+
+.documents-toolbar__toggle[aria-pressed='true'] {
+  border-color: var(--accent);
+  color: var(--accent);
+  background: var(--surface-subtle);
+}
+
+.documents-sort__direction {
+  padding: 0.3rem 0.45rem;
+}
+
+.documents-sort__direction[aria-pressed='true'] {
+  border-color: var(--border);
+  color: var(--muted);
+  background: transparent;
+}
+
+.documents-sort__direction svg {
+  width: 1.1rem;
+  height: 1.1rem;
+}
+
 .app-shell {
   height: 100%;
   display: flex;
@@ -1949,6 +2023,16 @@ button.danger:hover:not([disabled]) {
   box-shadow: 0 0 0 1.5px var(--sidebar-active-pill-border);
 }
 
+.sidebar-tag-pill--untagged {
+  border: 1px dashed var(--border);
+  background: var(--surface-subtle);
+  color: var(--muted);
+}
+
+.sidebar-tag-pill--untagged.active {
+  color: var(--fg);
+}
+
 .sidebar-tag-cloud--has-active .sidebar-tag-pill:not(.active) {
   opacity: 0.45;
 }
@@ -2818,6 +2902,11 @@ button.danger:hover:not([disabled]) {
   white-space: nowrap;
 }
 
+.documents-sort__trigger.quick-add__trigger {
+  padding: 0.25rem 0.5rem;
+  min-height: 2.1rem;
+}
+
 .quick-add__chip {
   display: inline-flex;
   align-items: center;
diff --git a/frontend/src/ui/icons.js b/frontend/src/ui/icons.js
index e8ca90c..1e85254 100644
--- a/frontend/src/ui/icons.js
+++ b/frontend/src/ui/icons.js
@@ -15,6 +15,8 @@ import {
   IconTextScan2,
   IconFolderPlus,
   IconFolder,
+  IconFolders,
+  IconFoldersOff,
   IconRefresh,
   IconRestore,
   IconMinusVertical,
@@ -34,6 +36,8 @@ import {
   IconCircleDashedCheck,
   IconFile,
   IconLoader,
+  IconSortAscendingLetters,
+  IconSortDescendingLetters,
 } from '@tabler/icons-react';
 import FolderSvg from '../assets/folder.svg';
 
@@ -190,6 +194,24 @@ export const FolderPlusIcon = ({ className, size = '1em', stroke = 1.6, ...rest
   />
 );
 
+export const FoldersIcon = ({ className, size = '1em', stroke = 1.6, ...rest }) => (
+  <IconFolders
+    className={composeClassName('icon', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
+export const FoldersOffIcon = ({ className, size = '1em', stroke = 1.6, ...rest }) => (
+  <IconFoldersOff
+    className={composeClassName('icon', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
 export const RefreshIcon = ({ className, size = '1em', stroke = 1.6, ...rest }) => (
   <IconRefresh
     className={composeClassName('icon', className)}
@@ -262,6 +284,24 @@ export const IconFileStack = ({ className, size = 24, stroke = 160, ...rest }) =
   );
 };
 
+export const SortAscendingLettersIcon = ({ className, size = '1em', stroke = 1.6, ...rest }) => (
+  <IconSortAscendingLetters
+    className={composeClassName('icon', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
+export const SortDescendingLettersIcon = ({ className, size = '1em', stroke = 1.6, ...rest }) => (
+  <IconSortDescendingLetters
+    className={composeClassName('icon', className)}
+    size={size}
+    stroke={stroke}
+    {...rest}
+  />
+);
+
 export const IconX = ({ className, size = '1em', stroke = 1.6, ...rest }) => (
   <TablerIconX
     className={composeClassName('icon', className)}