Codex App: Terminal toolbar button disappears after starting a chat/thread, but Cmd+J still works

[bumbuboon]

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

26.429.61741 (2429)

What subscription do you have?

Pro

What platform is your computer?

Darwin 25.3.0 arm64 arm macOS: 26.3.1 (a), build 25D771280a

What issue are you seeing?

In the Codex App, the top-right Terminal button is visible on the initial screen, but after I start a chat/thread it disappears from the toolbar.

The integrated terminal itself still works via Cmd+J.

This is confusing because the official Codex App docs say each thread includes a built-in terminal that can be toggled using the terminal icon in the top right or Cmd+J.

What steps can reproduce the bug?

1. Open Codex App.
2. Open a project.
3. Observe that the Terminal button appears in the top-right toolbar before starting a chat/thread.
4. Start a chat/thread.
5. Observe that the Terminal button disappears from the toolbar.
6. Press Cmd+J.
7. Observe that the integrated terminal still opens.

What is the expected behavior?

The Terminal button should remain visible in the top-right toolbar after starting a chat/thread, since it is the documented way to toggle the integrated terminal.

Additional information

Bundled Codex CLI version:
codex-cli 0.128.0-alpha.1

This looks related to #17929, where some threads are missing toolbar elements such as the Terminal button and Open in Editor button while Cmd+J still works.

It may also be adjacent to #20594, another terminal toolbar UI-state issue, though my case is about the button disappearing rather than appearing active.