Codex App: restore Shift+Tab Plan Mode toggle or make the shortcut configurable

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

Codex Desktop Version 150.0.7871.115.

What subscription do you have?

_No response_

What platform is your computer?

macOS, using the Codex desktop app.

What issue are you seeing?

In earlier versions of the Codex App, pressing Shift+Tab in the prompt composer toggled Plan Mode. In the current app, the same keypress moves focus to the previous UI control instead.

The Plan Mode tooltip now indicates Cmd+Shift+P, which does work. However, moving the shortcut away from the composer makes a frequent workflow action less discoverable and less convenient. Shift+Tab was particularly useful because it allowed a quick switch between planning and implementation without leaving the text input.

This is a workflow regression for users who relied on the original shortcut. If the change was intentional to support keyboard focus navigation, the app should at least offer a user-configurable Plan Mode shortcut.

What steps can reproduce the bug?

1. Open the Codex desktop app on macOS.
2. Open an existing or new task and focus the prompt composer.
3. Press Shift+Tab.
4. Observe that focus moves to the previous UI control instead of toggling Plan Mode.
5. Press Cmd+Shift+P.
6. Observe that Plan Mode toggles.

What is the expected behavior?

The app should provide a fast, discoverable way to toggle Plan Mode from the composer.

One acceptable resolution would be any of the following:

• restore Shift+Tab as the Plan Mode toggle;
• support both Shift+Tab and Cmd+Shift+P; or
• add a setting that lets users configure the Plan Mode shortcut.

What is the actual behavior?

Shift+Tab no longer toggles Plan Mode in the Codex App and instead performs focus navigation. The replacement shortcut is Cmd+Shift+P.

Additional information

This appears related to #11157, which documented the shortcut change and was closed as completed.

This request is specifically about the Codex desktop app. The CLI/TUI may continue to use Shift+Tab independently.