diff --git a/apps/mobile/src/components/pr-review/pr-review-screen.test.tsx b/apps/mobile/src/components/pr-review/pr-review-screen.test.tsx
index 9e032e372dc..01ba0feaa2a 100644
--- a/apps/mobile/src/components/pr-review/pr-review-screen.test.tsx
+++ b/apps/mobile/src/components/pr-review/pr-review-screen.test.tsx
@@ -272,6 +272,59 @@ describe('PrReviewScreen Submit review reachability (P1-F-46b)', () => {
   });
 });
 
+// The header caps a trailing action at half the row (ScreenHeader's
+// `max-w-[50%]`). A button whose label cannot shrink overflows that cap and is
+// clipped by the screen edge at large font scales — the explorer found the
+// Overview "Submit review" label cut off at font scale 2. The button and its
+// label must shrink and wrap instead, like the Agents header action.
+describe('PrReviewScreen Submit review header fit', () => {
+  function findSubmitButton(): React.ReactElement | null {
+    // eslint-disable-next-line new-cap
+    const element = PrReviewScreen({ owner: 'octocat', repo: 'hello', number: 7 });
+    return findElement({
+      node: element,
+      type: 'Button',
+      prop: 'accessibilityLabel',
+      value: 'Submit review',
+    });
+  }
+
+  it('lets the Submit review button shrink inside the header action slot', () => {
+    const button = findSubmitButton();
+    if (!button) {
+      throw new Error('Submit review button not found');
+    }
+    const className = (button.props as { className?: string }).className ?? '';
+    expect(className).toContain('shrink');
+    expect(className).not.toContain('shrink-0');
+    expect(className).toContain('min-w-0');
+  });
+
+  it('lets the Submit review label wrap instead of drawing off-screen', () => {
+    const button = findSubmitButton();
+    if (!button) {
+      throw new Error('Submit review button not found');
+    }
+    const label = findElement({
+      node: button,
+      type: 'Text',
+      prop: 'className',
+      value: 'shrink text-center',
+    });
+    if (!label) {
+      throw new Error('Submit review label not found');
+    }
+    const labelProps = label.props as {
+      numberOfLines?: number;
+      allowFontScaling?: boolean;
+    };
+    // Wrapping, not truncation: no line cap and no disabled scaling, so a
+    // large font scale grows the button instead of clipping the label.
+    expect(labelProps.numberOfLines).toBeUndefined();
+    expect(labelProps.allowFontScaling).not.toBe(false);
+  });
+});
+
 describe('PrReviewScreen share action', () => {
   beforeEach(() => {
     prQueryResult = {
diff --git a/apps/mobile/src/components/pr-review/pr-review-screen.tsx b/apps/mobile/src/components/pr-review/pr-review-screen.tsx
index 909bf753761..aee8846e9e9 100644
--- a/apps/mobile/src/components/pr-review/pr-review-screen.tsx
+++ b/apps/mobile/src/components/pr-review/pr-review-screen.tsx
@@ -296,10 +296,15 @@ export function PrReviewScreen({ owner, repo, number }: PrReviewScreenProps) {
                 onPress={openReviewSubmit}
                 disabled={loadFailed}
                 accessibilityLabel={t('prReview.submit.submitReview')}
-                className={cn('px-3')}
+                // ScreenHeader caps a trailing action at half the row. A label
+                // that cannot shrink overflows that cap and is clipped by the
+                // screen edge at large font scales, so the button and its
+                // label shrink and wrap (as the Agents header action does)
+                // instead of drawing off-screen.
+                className={cn('min-w-0 shrink px-3')}
               >
                 <Check size={14} color={colors.primaryForeground} />
-                <Text>{t('prReview.submit.submitReview')}</Text>
+                <Text className="shrink text-center">{t('prReview.submit.submitReview')}</Text>
               </Button>
             ) : null}
           </View>