diff --git a/src/web/public/panels-ui.js b/src/web/public/panels-ui.js
index ed026845..dedaea57 100644
--- a/src/web/public/panels-ui.js
+++ b/src/web/public/panels-ui.js
@@ -4622,13 +4622,9 @@ Object.assign(CodemanApp.prototype, {
     const on = this._filePreviewPref('expanded');
     const win = this.$('filePreviewOverlay')?.querySelector?.('.file-preview-window');
     win?.classList?.toggle('expanded', on);
-    const btn = this.$('filePreviewExpandBtn');
-    if (btn) {
-      btn.setAttribute('aria-pressed', on ? 'true' : 'false');
-      const label = on ? 'Restore size' : 'Expand';
-      btn.title = label;
-      btn.setAttribute('aria-label', label);
-    }
+    // The label stays "Expand" and aria-pressed carries the state, like MD, Lines and
+    // Wrap, so a screen reader never announces "Restore size, pressed".
+    this.$('filePreviewExpandBtn')?.setAttribute('aria-pressed', on ? 'true' : 'false');
   },
 
   /**
diff --git a/test/file-preview-window.test.ts b/test/file-preview-window.test.ts
index c29d25c4..bd9347dd 100644
--- a/test/file-preview-window.test.ts
+++ b/test/file-preview-window.test.ts
@@ -196,16 +196,22 @@ describe('file viewer back/forward', () => {
 describe('file viewer expand', () => {
   it('toggles the window class, the pref and the button state', () => {
     const { app, winClasses, store, expand } = loadApp();
+    // As index.html ships it.
+    expand.title = 'Expand';
+    expand.attrs['aria-label'] = 'Expand';
 
     app.toggleFilePreviewExpanded();
     expect(winClasses.has('expanded')).toBe(true);
     expect(store['codeman:filePreviewExpanded']).toBe('1');
     expect(expand.attrs['aria-pressed']).toBe('true');
-    expect(expand.title).toBe('Restore size');
+    // aria-pressed carries the state; the label stays fixed, like the MD/Lines/Wrap toggles.
+    expect(expand.title).toBe('Expand');
+    expect(expand.attrs['aria-label']).toBe('Expand');
 
     app.toggleFilePreviewExpanded();
     expect(winClasses.has('expanded')).toBe(false);
     expect(expand.attrs['aria-pressed']).toBe('false');
+    expect(expand.title).toBe('Expand');
   });
 
   it('re-applies a remembered expanded state when a preview opens', async () => {