diff --git a/docs/superpowers/plans/2026-04-22-maximize-tab-plan.md b/docs/superpowers/plans/2026-04-22-maximize-tab-plan.md
new file mode 100644
index 0000000..c4abec3
--- /dev/null
+++ b/docs/superpowers/plans/2026-04-22-maximize-tab-plan.md
@@ -0,0 +1,171 @@
+# Maximize Tab View — Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task.
+
+**Goal:** Add fullscreen maximize mode to each tab view, hiding Sidebar and TopBar for maximum data visibility.
+
+**Architecture:** Each view component manages its own `isFullscreen` state locally. No global state. Toggle between normal and fullscreen modes with conditional rendering.
+
+**Tech Stack:** React useState, lucide-react icons, Tailwind CSS
+
+---
+
+### Task 1: ProductDescriptions.tsx
+
+**Files:**
+- Modify: `src/components/ProductDescriptions.tsx`
+
+- [ ] **Step 1: Add imports and state**
+
+Add `Maximize2` to lucide-react imports.
+Add `useState` if not present.
+
+```tsx
+const [isFullscreen, setIsFullscreen] = useState(false);
+```
+
+- [ ] **Step 2: Add maximize button**
+
+Find the component's header section (where stats/controls are rendered).
+Add maximize button with `Maximize2` icon next to existing controls.
+
+```tsx
+<button
+  onClick={() => setIsFullscreen(true)}
+  className="p-2 text-slate-400 hover:text-slate-200 hover:bg-slate-700 rounded transition-colors"
+  title="Fullscreen"
+>
+  <Maximize2 className="w-5 h-5" />
+</button>
+```
+
+- [ ] **Step 3: Wrap content in conditional render**
+
+After existing return statement, wrap in:
+
+```tsx
+return (
+  <>
+    {isFullscreen ? (
+      <div className="fixed inset-0 z-40 bg-[#041021] p-6 overflow-auto">
+        <button
+          onClick={() => setIsFullscreen(false)}
+          className="fixed top-4 right-4 z-50 w-10 h-10 flex items-center justify-center bg-slate-800/90 backdrop-blur border border-slate-600 text-white rounded hover:bg-slate-700 hover:scale-105 transition-all"
+          title="Exit fullscreen"
+        >
+          <X className="w-5 h-5" />
+        </button>
+        {/* Existing JSX content - remove any overflow constraints */}
+        <div className="[content goes here]" />
+      </div>
+    ) : (
+      <div className="...">
+        {/* Existing JSX content - keep current overflow settings */}
+        <div className="[content goes here]" />
+      </div>
+    )}
+  </>
+);
+```
+
+---
+
+### Task 2: MatrixView.tsx
+
+**Files:**
+- Modify: `src/components/MatrixView.tsx`
+
+- [ ] **Step 1: Add imports and state**
+
+Add `Maximize2`, `X` to lucide-react imports.
+Add `useState` if not present.
+
+- [ ] **Step 2: Add maximize button**
+
+Add button in the header area (search bar section).
+
+- [ ] **Step 3: Add conditional render**
+
+Same pattern as Task 1.
+
+---
+
+### Task 3: DimensionsView.tsx
+
+**Files:**
+- Modify: `src/components/DimensionsView.tsx`
+
+- [ ] **Step 1: Add imports and state**
+
+- [ ] **Step 2: Add maximize button**
+
+- [ ] **Step 3: Add conditional render**
+
+---
+
+### Task 4: PricingView.tsx
+
+**Files:**
+- Modify: `src/components/PricingView.tsx`
+
+- [ ] **Step 1: Add imports and state**
+
+- [ ] **Step 2: Add maximize button**
+
+- [ ] **Step 3: Add conditional render**
+
+---
+
+### Task 5: ArticleDetails.tsx
+
+**Files:**
+- Modify: `src/components/ArticleDetails.tsx`
+
+- [ ] **Step 1: Add imports and state**
+
+- [ ] **Step 2: Add maximize button**
+
+- [ ] **Step 3: Add conditional render**
+
+---
+
+### Task 6: PendingValidationView.tsx
+
+**Files:**
+- Modify: `src/components/PendingValidationView.tsx`
+
+- [ ] **Step 1: Add imports and state**
+
+- [ ] **Step 2: Add maximize button**
+
+- [ ] **Step 3: Add conditional render**
+
+---
+
+### Task 7: MissingDataView.tsx
+
+**Files:**
+- Modify: `src/components/MissingDataView.tsx`
+
+- [ ] **Step 1: Add imports and state**
+
+- [ ] **Step 2: Add maximize button**
+
+- [ ] **Step 3: Add conditional render**
+
+---
+
+### Task 8: HistoryView.tsx
+
+**Files:**
+- Modify: `src/components/HistoryView.tsx`
+
+- [ ] **Step 1: Add imports and state**
+
+- [ ] **Step 2: Add maximize button**
+
+- [ ] **Step 3: Add conditional render**
+
+---
+
+**Verification:** Run `npm run lint` to ensure no TypeScript errors.
\ No newline at end of file
diff --git a/docs/superpowers/specs/2026-04-22-maximize-tab-design.md b/docs/superpowers/specs/2026-04-22-maximize-tab-design.md
new file mode 100644
index 0000000..f582e5a
--- /dev/null
+++ b/docs/superpowers/specs/2026-04-22-maximize-tab-design.md
@@ -0,0 +1,112 @@
+# Maximize Tab View — Spec
+
+## Concept & Vision
+
+Each tab view (Matrix, Product Descriptions, Dimensions, etc.) can be maximized to fullscreen mode, hiding all navigation chrome (Sidebar, TopBar) to maximize data visibility. A floating close button allows returning to normal view. The effect is immersive and focused — like pressing F11 in a browser.
+
+## Design
+
+### Normal Mode
+- Sidebar (240px) visible on left
+- TopBar visible on top
+- Main content fills remaining space
+
+### Maximized Mode
+- Sidebar: `display: none`
+- TopBar: `display: none`
+- Fullscreen overlay covers entire viewport
+- Background: `#041021` (matches main content bg)
+- Content area: max-height `100vh`, overflow scroll
+- Floating close button: top-right corner, fixed position
+
+### Close Button
+- Position: fixed, top-right
+- Size: 40x40px
+- Background: `rgba(30, 41, 59, 0.9)` with blur
+- Border: 1px `slate-600`
+- Icon: `X` from lucide-react, white, 20px
+- Hover: bg `slate-700`, scale 1.05
+- Z-index: 50
+- Tooltip: "Exit fullscreen"
+
+## Layout & Structure
+
+### Implementation Pattern
+
+Each view component receives `isFullscreen?: boolean` prop and renders:
+
+```
+{maximizeButton && (
+  <button onClick={toggleFullscreen} className="..." title="Fullscreen">
+    <Maximize2 />
+  </button>
+)}
+
+{isFullscreen ? (
+  <div className="fixed inset-0 z-40 bg-[#041021] p-6 overflow-auto">
+    <button onClick={toggleFullscreen} className="fixed top-4 right-4 ...">
+      <X />
+    </button>
+    {/* Tab content rendered at full height */}
+  </div>
+) : (
+  <div className="...">
+    {/* Tab content normal */}
+  </div>
+)}
+```
+
+### State Management
+- Each tab manages its own `isFullscreen` state locally
+- No global state needed — each tab remembers its own fullscreen mode
+- State resets to normal when switching tabs (intentional)
+
+## Features & Interactions
+
+### Toggle Button
+- Location: Each tab view has a maximize button (icon) in its header area
+- Icon: `Maximize2` from lucide-react
+- Click: Enter fullscreen mode
+- Hover: Slight scale increase, cursor pointer
+
+### Exit Fullscreen
+- Click floating X button
+- Instantly returns to normal layout
+- No animation needed
+
+## Component Inventory
+
+### MaximizeButton (in each tab header)
+- States: default, hover
+- Color: `slate-400` default, `slate-200` hover
+
+### FullscreenCloseButton (floating)
+- States: default, hover, active
+- Default: semi-transparent dark bg, subtle border
+- Hover: lighter bg, slight scale
+- Z-index ensures it's above all content
+
+### FullscreenOverlay
+- Fixed positioning
+- Matches app background color
+- Contains scrollable content
+
+## Technical Approach
+
+- Add `isFullscreen` state to each view component
+- Add toggle function
+- Conditional rendering based on state
+- Icons from `lucide-react`: `Maximize2`, `X`
+- All styling via Tailwind classes
+- No additional dependencies
+
+## Affected Components
+
+1. `ProductDescriptions.tsx`
+2. `MatrixView.tsx`
+3. `DimensionsView.tsx`
+4. `PricingView.tsx`
+5. `ArticleDetails.tsx`
+6. `PendingValidationView.tsx`
+7. `MissingDataView.tsx`
+8. `HistoryView.tsx`
\ No newline at end of file
diff --git a/src/App.tsx b/src/App.tsx
index 619f126..a5a9129 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -523,6 +523,8 @@ export default function App() {
     };
   }, [appState.data]);
 
+  const [isMaximized, setIsMaximized] = useState(false);
+
   if (!session) {
     return <LoginPage onLogin={() => {
       const stored = getStoredSession();
@@ -534,28 +536,49 @@ export default function App() {
   return (
     <ColumnsProvider headers={appState.headers}>
       <div className="h-screen bg-[#040d1a] text-slate-200 flex flex-col font-sans overflow-hidden">
-      <TopBar
-        stats={stats}
-        activeModule={activeModule}
-        onExport={handleExport}
-        onRefresh={() => { setRefreshTrigger(t => t + 1); }}
-        hasData={appState.data.length > 0}
-        hasUnsavedChanges={appState.hasUnsavedChanges}
-        userEmail={session.user.email}
-        onSignOut={handleSignOut}
-        canUndo={undoHistory.length > 0}
-        onUndo={handleUndo}
-        undoMessage={undoHistory[0]?.message}
-        undoSteps={undoHistory.length}
-        pendingCount={Object.keys(pendingRows).length}
-        pendingChanges={Object.fromEntries(Object.entries(pendingRows).map(([k, v]) => [k, { articleName: (v as any).articleName }]))}
-        onSaveAll={handleSaveAll}
-        onRevertRow={handleRevertRow}
-        isSavingAll={isSavingAll}
-      />
+      {!isMaximized && (
+        <TopBar
+          stats={stats}
+          activeModule={activeModule}
+          onExport={handleExport}
+          onRefresh={() => { setRefreshTrigger(t => t + 1); }}
+          hasData={appState.data.length > 0}
+          hasUnsavedChanges={appState.hasUnsavedChanges}
+          userEmail={session.user.email}
+          onSignOut={handleSignOut}
+          canUndo={undoHistory.length > 0}
+          onUndo={handleUndo}
+          undoMessage={undoHistory[0]?.message}
+          undoSteps={undoHistory.length}
+          pendingCount={Object.keys(pendingRows).length}
+          pendingChanges={Object.fromEntries(Object.entries(pendingRows).map(([k, v]) => [k, { articleName: (v as any).articleName }]))}
+          onSaveAll={handleSaveAll}
+          onRevertRow={handleRevertRow}
+          isSavingAll={isSavingAll}
+          isMaximized={isMaximized}
+          onToggleMaximize={() => setIsMaximized(true)}
+        />
+      )}
       <div className="flex flex-1 overflow-hidden">
-        <Sidebar activeModule={activeModule} setActiveModule={setActiveModule} userEmail={session.user.email} />
-        <main className="flex-1 overflow-auto relative p-6 bg-[#041021]">
+        {!isMaximized && (
+          <Sidebar activeModule={activeModule} setActiveModule={setActiveModule} userEmail={session.user.email} />
+        )}
+        <main className={cn(
+          "flex-1 overflow-auto relative bg-[#041021] transition-all duration-300",
+          isMaximized ? "p-0" : "p-6"
+        )}>
+          {isMaximized && (
+            <button
+              onClick={() => setIsMaximized(false)}
+              className="fixed top-4 right-4 z-[100] p-3 bg-slate-800 hover:bg-slate-700 text-slate-400 hover:text-white rounded-full shadow-2xl border border-slate-700 transition-all active:scale-95 group"
+              title="Exit Fullscreen"
+            >
+              <X className="w-6 h-6" />
+              <span className="absolute right-full mr-2 top-1/2 -translate-y-1/2 px-2 py-1 bg-slate-900 text-xs text-white rounded opacity-0 group-hover:opacity-100 transition-opacity whitespace-nowrap">
+                Exit Fullscreen
+              </span>
+            </button>
+          )}
           {isLoadingDefault ? (
             <div className="flex flex-col items-center justify-center h-full text-slate-400">
               <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-500 mb-4"></div>
diff --git a/src/components/ProductDescriptions.tsx b/src/components/ProductDescriptions.tsx
index f01a3fa..9041716 100644
--- a/src/components/ProductDescriptions.tsx
+++ b/src/components/ProductDescriptions.tsx
@@ -1,7 +1,7 @@
 import React, { useState, useMemo } from 'react';
 import { ExcelRow } from '../types';
 import { useColumns } from '../contexts/ColumnsContext';
-import { Search, Filter, Edit2, ChevronDown, ChevronUp, X } from 'lucide-react';
+import { Search, Filter, Edit2, ChevronDown, ChevronUp, X, Maximize2 } from 'lucide-react';
 import { cn } from '../lib/utils';
 import { ColumnFilterPopover } from './ColumnFilterPopover';
 
@@ -15,6 +15,7 @@ interface ProductDescriptionsProps {
 
 export function ProductDescriptions({ data, headers, asinColumnIndex, onEdit, rowStatuses }: ProductDescriptionsProps) {
   const COLUMNS = useColumns();
+  const [isFullscreen, setIsFullscreen] = useState(false);
 
   // Description columns that should only have Present/Missing filters
   const DESCRIPTION_COLUMNS = [COLUMNS.LONG_DE, COLUMNS.LONG_EN, COLUMNS.SHORT_DE, COLUMNS.SHORT_EN, COLUMNS.DETAILS_DE, COLUMNS.DETAILS_EN];
diff --git a/src/components/TopBar.tsx b/src/components/TopBar.tsx
index 5fb625d..d5d7e47 100644
--- a/src/components/TopBar.tsx
+++ b/src/components/TopBar.tsx
@@ -1,5 +1,5 @@
 import React, { useState, useRef, useEffect } from 'react';
-import { Download, LogOut, Undo2, CloudUpload, Loader2, ChevronDown, RotateCcw } from 'lucide-react';
+import { Download, LogOut, Undo2, CloudUpload, Loader2, ChevronDown, RotateCcw, Maximize2, X } from 'lucide-react';
 import { cn } from '../lib/utils';
 
 interface TopBarProps {
@@ -20,9 +20,11 @@ interface TopBarProps {
   onSaveAll: () => Promise<void>;
   onRevertRow: (articleNo: string) => void;
   isSavingAll: boolean;
+  isMaximized: boolean;
+  onToggleMaximize: () => void;
 }
 
-export function TopBar({ stats, activeModule, onExport, onRefresh, hasData, hasUnsavedChanges, userEmail, onSignOut, canUndo, onUndo, undoMessage, undoSteps, pendingCount, pendingChanges, onSaveAll, onRevertRow, isSavingAll }: TopBarProps) {
+export function TopBar({ stats, activeModule, onExport, onRefresh, hasData, hasUnsavedChanges, userEmail, onSignOut, canUndo, onUndo, undoMessage, undoSteps, pendingCount, pendingChanges, onSaveAll, onRevertRow, isSavingAll, isMaximized, onToggleMaximize }: TopBarProps) {
   const [showPending, setShowPending] = useState(false);
   const dropdownRef = useRef<HTMLDivElement>(null);
 
@@ -179,6 +181,15 @@ export function TopBar({ stats, activeModule, onExport, onRefresh, hasData, hasU
           </button>
         )}
 
+        <button
+          onClick={onToggleMaximize}
+          className="flex items-center gap-2 px-4 py-2 rounded-md text-sm font-medium bg-slate-700 hover:bg-slate-600 text-slate-200 transition-colors"
+          title="Maximize - View table in full screen"
+        >
+          <Maximize2 className="w-4 h-4" />
+          MAXIMIZE
+        </button>
+
         <button
           onClick={onUndo}
           disabled={!canUndo}