diff --git a/apps/web/e2e/adaptive-workspace.spec.ts b/apps/web/e2e/adaptive-workspace.spec.ts
index b4b4416..5b85370 100644
--- a/apps/web/e2e/adaptive-workspace.spec.ts
+++ b/apps/web/e2e/adaptive-workspace.spec.ts
@@ -35,8 +35,9 @@ test("the bot's screen opens beside the chat while it works and steps back after
     "src",
     SCREEN_URL,
   );
-  // The live screen gets more room than a settings panel.
-  expect((await sidePanel.boundingBox())!.width).toBeGreaterThan(400);
+  // The live screen gets more room than a settings panel. The panel widens
+  // over a CSS transition, so measure once it has settled.
+  await expect.poll(async () => (await sidePanel.boundingBox())?.width ?? 0).toBeGreaterThan(400);
   await captureScreenshot(page, testInfo, "workspace-screen-beside-chat");
 
   // Once the work is done the conversation gets its full width back.