[macOS] Toggle Sidebar mouse click is ignored on New Chat; shortcut still works

What version of the Codex App are you using (From “About Codex” dialog)?

26.831.21537 (Build 7579)

What subscription do you have?

ChatGPT Pro

What platform is your computer?

Darwin 25.6.0 arm64 arm

What issue are you seeing?

After updating to ChatGPT/Codex Desktop 26.831.21537, the toolbar's Toggle Sidebar button does not respond to mouse clicks while the app is on the New Chat landing page before the first message is sent. The sidebar remains unchanged.

The Toggle Sidebar keyboard shortcut continues to work in that same state. The failure is limited to activating the visible toolbar button with the mouse.

After sending a message and starting the conversation, the same toolbar button works normally and toggles the sidebar. The behavior is the same in a normal window and in macOS full-screen mode entered with the green window button.

This appears to be a state- and input-specific regression introduced by the current app update; the rest of the app remains usable.

What steps can reproduce the bug?

Feedback ID: 01a0616b-798e-7c72-a4ee-d054a7193e26

1. Launch the ChatGPT/Codex desktop app on macOS.
2. Choose New chat.
3. Stay on the landing page without sending a message.
4. Click the visible Toggle Sidebar button with the mouse.
5. Observe that nothing happens and the sidebar remains unchanged.
6. Invoke the keyboard shortcut for Toggle Sidebar while still on the same New Chat landing page.
7. Observe that the shortcut works and the sidebar toggles.
8. Send any message to start the conversation.
9. Click the visible Toggle Sidebar button with the mouse again.
10. Observe that mouse activation now works normally.
11. Repeat with macOS full-screen mode enabled and disabled; the result continues to depend on whether the conversation has started, not on window mode.

What is the expected behavior?

Both the visible Toggle Sidebar button and its keyboard shortcut should expand or collapse the sidebar on the New Chat landing page as well as after a conversation has started, in both normal and macOS full-screen window modes.

Additional information

Input-specific scope

• Mouse click on the visible Toggle Sidebar button fails on the New Chat landing page.
• The keyboard shortcut for Toggle Sidebar remains functional on that same page.
• After a conversation starts, both the mouse button and keyboard shortcut work normally.

This suggests that the sidebar toggle command remains available and that the regression may be limited to mouse hit-testing or toolbar-button event handling on the New Chat landing page.

Diagnostics

• Feedback ID: 01a0616b-798e-7c72-a4ee-d054a7193e26
• App display name: ChatGPT
• Bundle ID: com.openai.codex
• App version: 26.831.21537 (Build 7579)
• App update timestamp: 2026-09-02 15:02:29 +0800
• macOS: 26.6.2 (Build 25G83)
• Hardware: Mac mini (Mac14,3), Apple M2, 8-core CPU, 10-core GPU, 16 GB RAM
• Architecture: arm64
• Locale: zh_TW
• Chromium runtime: 152.0.7977.64
• App signature verification: valid on disk; accepted as Notarized Developer ID

Related search result

I searched existing open and closed issues and did not find an exact duplicate for the macOS Toggle Sidebar control. Issue #42191 may be related because a different top-bar control is also unclickable specifically on the New Chat page after a recent update, but it concerns Windows and the ChatGPT/Codex selector rather than the sidebar toggle: https://github.com/openai/codex/issues/42191

Screenshots are available, but the original captures are omitted from this public issue because they contain personal sidebar and account information. Redacted captures can be provided if requested.

AI assistance disclosure

This report was prepared with assistance from OpenAI gpt-5.6-Sol using Extra High reasoning, at the reporter's request. The reporter personally reproduced and verified the behavioral observations and environment details above.

Start by reproducing the issue from the New Chat landing page and inspect the Toggle Sidebar toolbar entry point, comparing mouse activation with the working keyboard shortcut before and after a conversation starts. Done means mouse clicks toggle the sidebar in both states and in normal and full-screen macOS windows, while the existing shortcut continues to work.