diff --git a/frontend/src/features/lists/SharedListsView.tsx b/frontend/src/features/lists/SharedListsView.tsx
index d09e1dc..0bd02cb 100644
--- a/frontend/src/features/lists/SharedListsView.tsx
+++ b/frontend/src/features/lists/SharedListsView.tsx
@@ -11,7 +11,7 @@ import {
 } from 'lucide-react';
 import { ListItem, SharedList, Team, User, WSMessage } from '../../lib/types';
 import { api, triggerHaptic, createRealtimeConnection } from '../../lib/api';
-import { readViewSession, writeViewSession } from '../../lib/viewSession';
+import { readViewMemory, writeViewMemory } from '../../lib/viewSession';
 import { OFFLINE_ITEM_PREFIX, pendingListItems } from '../../lib/offline';
 import { UnifiedShareModal } from '../../components/UnifiedShareModal';
 import { AvatarStack, AvatarPerson } from '../../components/AvatarStack';
@@ -91,12 +91,12 @@ export function deduplicateItems(items: ListItem[]): ListItem[] {
 export const SharedListsView: React.FC<SharedListsViewProps> = ({ onRefreshGlobal, currentUser, initialListId }) => {
   const { setGroups, setPrimaryAction } = useMobileActions();
   const [lists, setLists] = useState<SharedList[]>([]);
-  // The open list survives switching to other tabs (like the workspace's open note)
+  // The open list is remembered on this device (other tabs of the app, new tab, restart)
   const [activeListId, setActiveListId] = useState<string>(
-    () => initialListId || readViewSession<{ listId: string }>('lists').listId || ''
+    () => initialListId || readViewMemory<{ listId: string }>('lists').listId || ''
   );
   useEffect(() => {
-    if (activeListId) writeViewSession('lists', { listId: activeListId });
+    if (activeListId) writeViewMemory('lists', { listId: activeListId });
   }, [activeListId]);
 
   useEffect(() => {
diff --git a/frontend/src/features/triage/TasksView.tsx b/frontend/src/features/triage/TasksView.tsx
index ac3df51..a908465 100644
--- a/frontend/src/features/triage/TasksView.tsx
+++ b/frontend/src/features/triage/TasksView.tsx
@@ -30,7 +30,7 @@ import {
 } from 'lucide-react';
 import { TaskList, Thought, SubTask, Team, User, TaskListMember, KanbanColumn, PriorityLevel, Recurrence, RECURRENCE_LABELS, TrashedTask } from '../../lib/types';
 import { formatDeletedAt, formatDue, isDueToday, isOverdue, localDay, splitDue } from '../../lib/due';
-import { readViewSession, writeViewSession } from '../../lib/viewSession';
+import { readViewMemory, writeViewMemory } from '../../lib/viewSession';
 import { useKanbanTouchDrag } from './useKanbanTouchDrag';
 import { api, triggerHaptic } from '../../lib/api';
 import { UnifiedShareModal } from '../../components/UnifiedShareModal';
@@ -91,7 +91,28 @@ const kanbanBoardStyle = (wide: boolean, columns: number): React.CSSProperties =
   } as React.CSSProperties;
 };
 
-type TasksSession = { listId: string; viewMode: 'list' | 'kanban' };
+type GroupBy = 'none' | 'list' | 'tag' | 'status' | 'priority' | 'due';
+type TasksSession = { listId: string; viewMode: 'list' | 'kanban'; groupAll: GroupBy; groupList: GroupBy };
+
+// "Alle Aufgaben" is grouped by task list unless the user picks something else; a single list has no
+// grouping by default (grouping it by list would give one group)
+const DEFAULT_GROUP_ALL: GroupBy = 'list';
+const DEFAULT_GROUP_LIST: GroupBy = 'none';
+const GROUP_LABELS: Record<GroupBy, string> = {
+  none: 'Keine',
+  list: 'Nach Liste',
+  tag: 'Nach Hashtag',
+  status: 'Nach Status',
+  priority: 'Nach Priorität',
+  due: 'Nach Fälligkeit',
+};
+const SORT_LABELS: Record<string, string> = {
+  custom: 'Manuell',
+  created: 'Erstelldatum',
+  due: 'Fälligkeitsdatum',
+  priority: 'Priorität',
+  alpha: 'Alphabetisch',
+};
 
 export const TasksView: React.FC<TasksViewProps> = ({
   currentUser,
@@ -102,9 +123,18 @@ export const TasksView: React.FC<TasksViewProps> = ({
   onInitialTaskShown,
   openTasksCount,
 }) => {
-  // Open list and view survive switching to other tabs (like the workspace's open note)
+  // Open list, view and grouping are remembered on this device (new tab, restart of the installed app)
+  const remembered = useMemo(() => readViewMemory<TasksSession>('tasks'), []);
   const [viewMode, setViewMode] = useState<'list' | 'kanban'>(() =>
-    readViewSession<TasksSession>('tasks').viewMode === 'kanban' ? 'kanban' : 'list'
+    remembered.viewMode === 'kanban' ? 'kanban' : 'list'
+  );
+  const [groupAll, setGroupAll] = useState<GroupBy>(() =>
+    remembered.groupAll && remembered.groupAll in GROUP_LABELS ? remembered.groupAll : DEFAULT_GROUP_ALL
+  );
+  const [groupList, setGroupList] = useState<GroupBy>(() =>
+    remembered.groupList && remembered.groupList in GROUP_LABELS && remembered.groupList !== 'list'
+      ? remembered.groupList
+      : DEFAULT_GROUP_LIST
   );
   // Wide Kanban: the board takes the whole window and shows every column in one row
   const [kanbanWide, setKanbanWide] = useState(() => {
@@ -128,11 +158,19 @@ export const TasksView: React.FC<TasksViewProps> = ({
   const [tasks, setTasks] = useState<Thought[]>([]);
   const [taskLists, setTaskLists] = useState<TaskList[]>([]);
   const [selectedListId, setSelectedListId] = useState<string>(
-    () => readViewSession<TasksSession>('tasks').listId || 'all'
+    () => remembered.listId || 'all'
   );
+  const isAllTasks = selectedListId === 'all';
+  const groupBy: GroupBy = isAllTasks ? groupAll : groupList;
+  const setGroupBy = (g: GroupBy) => (isAllTasks ? setGroupAll(g) : setGroupList(g));
+  const defaultGroupBy = isAllTasks ? DEFAULT_GROUP_ALL : DEFAULT_GROUP_LIST;
+  // "Nach Liste" only where several lists show up
+  const groupOptions = (Object.keys(GROUP_LABELS) as GroupBy[])
+    .filter((id) => isAllTasks || id !== 'list')
+    .map((id) => ({ id, label: GROUP_LABELS[id] }));
   useEffect(() => {
-    writeViewSession<TasksSession>('tasks', { listId: selectedListId, viewMode });
-  }, [selectedListId, viewMode]);
+    writeViewMemory<TasksSession>('tasks', { listId: selectedListId, viewMode, groupAll, groupList });
+  }, [selectedListId, viewMode, groupAll, groupList]);
   const [teams, setTeams] = useState<Team[]>([]);
   const [collaborators, setCollaborators] = useState<User[]>([]);
   // Task trash of the selected list (or all): deleted tasks and cleared or cleaned-up completed ones
@@ -216,7 +254,6 @@ export const TasksView: React.FC<TasksViewProps> = ({
   const tagRowRef = useRef<HTMLDivElement>(null);
   const [tagsExpanded, setTagsExpanded] = useState(false);
   const [tagsOverflow, setTagsOverflow] = useState(false);
-  const [groupBy, setGroupBy] = useState<'none' | 'tag' | 'status' | 'priority' | 'due'>('none');
   const [sortBy, setSortBy] = useState<'custom' | 'created' | 'due' | 'priority' | 'alpha'>('custom');
 
   // Reloads happen after almost every action and on realtime events. Only the first load of a list shows
@@ -571,7 +608,25 @@ export const TasksView: React.FC<TasksViewProps> = ({
     if (groupBy === 'none') return null;
     const groups: { key: string; title: string; count: number; tasks: Thought[] }[] = [];
 
-    if (groupBy === 'tag') {
+    if (groupBy === 'list') {
+      // Tasks without a list first, then the lists in the order of the tabs
+      const byList = new Map<string, Thought[]>();
+      for (const t of filteredTasks) {
+        const key = t.taskListId || '';
+        if (!byList.has(key)) byList.set(key, []);
+        byList.get(key)!.push(t);
+      }
+      const without = byList.get('') || [];
+      if (without.length > 0) groups.push({ key: 'list:none', title: 'Ohne Liste', count: without.length, tasks: without });
+      for (const tl of safeTaskLists) {
+        const list = byList.get(tl.id);
+        if (!list || list.length === 0) continue;
+        groups.push({ key: `list:${tl.id}`, title: [tl.icon, tl.title].filter(Boolean).join(' '), count: list.length, tasks: list });
+        byList.delete(tl.id);
+      }
+      byList.delete('');
+      byList.forEach((list, id) => groups.push({ key: `list:${id}`, title: 'Andere Liste', count: list.length, tasks: list }));
+    } else if (groupBy === 'tag') {
       const map = new Map<string, Thought[]>();
       const withoutTag: Thought[] = [];
       for (const t of filteredTasks) {
@@ -616,7 +671,7 @@ export const TasksView: React.FC<TasksViewProps> = ({
       if (noDue.length > 0) groups.push({ key: 'due:none', title: 'Ohne Fälligkeitsdatum', count: noDue.length, tasks: noDue });
     }
     return groups;
-  }, [filteredTasks, groupBy, boardColumns, inBoardColumn]);
+  }, [filteredTasks, groupBy, boardColumns, inBoardColumn, safeTaskLists]);
 
   // --- TASK ACTIONS ---
 
@@ -1341,7 +1396,7 @@ export const TasksView: React.FC<TasksViewProps> = ({
     ];
 
     const filterSortActiveCount =
-      (selectedTag ? 1 : 0) + (groupBy !== 'none' ? 1 : 0) + (sortBy !== 'custom' ? 1 : 0);
+      (selectedTag ? 1 : 0) + (groupBy !== defaultGroupBy ? 1 : 0) + (sortBy !== 'custom' ? 1 : 0);
 
     const filterItems: any[] = [
       {
@@ -1482,6 +1537,7 @@ export const TasksView: React.FC<TasksViewProps> = ({
     selectedListId,
     selectedTag,
     groupBy,
+    defaultGroupBy,
     sortBy,
     openTasks.length,
     doneTasks.length,
@@ -2051,7 +2107,7 @@ export const TasksView: React.FC<TasksViewProps> = ({
       )}
 
       {/* Mobile Active Filter Badge Banner (minimal and clean) */}
-      {(selectedTag || groupBy !== 'none' || sortBy !== 'custom') && (
+      {(selectedTag || groupBy !== defaultGroupBy || sortBy !== 'custom') && (
         <div className="flex sm:hidden items-center justify-between gap-2 p-2 rounded-btn bg-accent/10 border border-accent/20 text-xs">
           <div className="flex items-center gap-1.5 flex-wrap min-w-0">
             <Filter className="w-3.5 h-3.5 text-accent flex-shrink-0" />
@@ -2067,14 +2123,14 @@ export const TasksView: React.FC<TasksViewProps> = ({
                 </button>
               </span>
             )}
-            {groupBy !== 'none' && (
+            {groupBy !== defaultGroupBy && (
               <span className="text-muted text-[11px]">
-                Gruppe: <strong className="text-main">{groupBy}</strong>
+                Gruppe: <strong className="text-main">{GROUP_LABELS[groupBy]}</strong>
               </span>
             )}
             {sortBy !== 'custom' && (
               <span className="text-muted text-[11px]">
-                Sortiert: <strong className="text-main">{sortBy}</strong>
+                Sortiert: <strong className="text-main">{SORT_LABELS[sortBy]}</strong>
               </span>
             )}
           </div>
@@ -2082,7 +2138,7 @@ export const TasksView: React.FC<TasksViewProps> = ({
             type="button"
             onClick={() => {
               setSelectedTag(null);
-              setGroupBy('none');
+              setGroupBy(defaultGroupBy);
               setSortBy('custom');
             }}
             className="text-accent text-[11px] font-semibold flex-shrink-0 hover:underline cursor-pointer"
@@ -2397,17 +2453,11 @@ export const TasksView: React.FC<TasksViewProps> = ({
                   Gruppierung
                 </span>
                 <div className="grid grid-cols-2 gap-1.5">
-                  {[
-                    { id: 'none', label: 'Keine' },
-                    { id: 'tag', label: 'Nach Hashtag' },
-                    { id: 'status', label: 'Nach Status' },
-                    { id: 'priority', label: 'Nach Priorität' },
-                    { id: 'due', label: 'Nach Fälligkeit' },
-                  ].map((g) => (
+                  {groupOptions.map((g) => (
                     <button
                       key={g.id}
                       type="button"
-                      onClick={() => setGroupBy(g.id as any)}
+                      onClick={() => setGroupBy(g.id)}
                       className={`min-h-[36px] px-3 text-xs rounded-btn border text-left transition-colors cursor-pointer ${
                         groupBy === g.id
                           ? 'bg-accent-dim border-accent text-accent font-semibold'
@@ -2457,7 +2507,7 @@ export const TasksView: React.FC<TasksViewProps> = ({
                 type="button"
                 onClick={() => {
                   setSelectedTag(null);
-                  setGroupBy('none');
+                  setGroupBy(defaultGroupBy);
                   setSortBy('custom');
                 }}
                 className="btn-ghost h-9 px-3 text-xs text-muted hover:text-main cursor-pointer"
@@ -2918,14 +2968,14 @@ export const TasksView: React.FC<TasksViewProps> = ({
                 <span className="text-[11px]">Gruppe:</span>
                 <select
                   value={groupBy}
-                  onChange={(e) => setGroupBy(e.target.value as any)}
+                  onChange={(e) => setGroupBy(e.target.value as GroupBy)}
                   className="h-8 px-2 input-field text-xs bg-panel"
                 >
-                  <option value="none">Keine</option>
-                  <option value="tag">Nach Hashtag</option>
-                  <option value="status">Nach Status</option>
-                  <option value="priority">Nach Priorität</option>
-                  <option value="due">Nach Fälligkeit</option>
+                  {groupOptions.map((g) => (
+                    <option key={g.id} value={g.id}>
+                      {g.label}
+                    </option>
+                  ))}
                 </select>
               </div>
               <div className="flex items-center gap-1 text-xs text-muted">
@@ -3014,7 +3064,7 @@ export const TasksView: React.FC<TasksViewProps> = ({
             </div>
           ) : (
             <div className="space-y-3">
-              {groupedTasks ? (
+              {groupedTasks && groupedTasks.length > 0 ? (
                 /* GROUPED LIST */
                 groupedTasks.map((grp) => (
                   <div key={grp.key} className="panel-surface overflow-hidden">
diff --git a/frontend/src/lib/viewSession.ts b/frontend/src/lib/viewSession.ts
index 51f0f4e..85f0b8c 100644
--- a/frontend/src/lib/viewSession.ts
+++ b/frontend/src/lib/viewSession.ts
@@ -18,3 +18,27 @@ export function writeViewSession<T extends object>(view: string, state: T) {
     // storage blocked: the view simply starts fresh
   }
 }
+
+// Remembered per device as well (localStorage): a new tab or a restart of the installed app opens the
+// same list again. This tab's own state wins, so two tabs can show different lists.
+const DEVICE_PREFIX = 'mindsift_view_device:';
+
+export function readViewMemory<T extends object>(view: string): Partial<T> {
+  let device: Partial<T> = {};
+  try {
+    const raw = JSON.parse(localStorage.getItem(DEVICE_PREFIX + view) || '{}');
+    if (raw && typeof raw === 'object') device = raw;
+  } catch {
+    // storage blocked or broken: the tab state alone
+  }
+  return { ...device, ...readViewSession<T>(view) };
+}
+
+export function writeViewMemory<T extends object>(view: string, state: T) {
+  writeViewSession(view, state);
+  try {
+    localStorage.setItem(DEVICE_PREFIX + view, JSON.stringify(state));
+  } catch {
+    // only a convenience
+  }
+}