Cannot change model after plan is generated in Planning Mode (model selector overlaps “Implement plan” options)

What version of the IDE extension are you using?

0.5.80

What subscription do you have?

plus, team

Which IDE are you using?

VS Code

What platform is your computer?

Windows x64

What issue are you seeing?

While using Planning Mode in Codex, I noticed an issue with the UI after a plan is generated.

When the planning phase finishes, Codex shows the options:

• Implement plan
• No, tell GPT what to do instead

At this moment, the model selector becomes hidden/overlapped by the action UI, which makes it impossible to switch models before implementing the plan.

The only workaround currently is to cancel the plan, change the model manually, and then ask Codex to implement the plan again. This interrupts the workflow and feels unnecessary.

<img width="493" height="193" alt="Image" src="https://github.com/user-attachments/assets/87e7d7d0-57f3-4c6e-b7a8-6705fca75fe0" />

What steps can reproduce the bug?

1. Start a conversation in Codex with Planning Mode enabled.
2. Select a lightweight model (e.g. gpt-5.1-codex-mini).
3. Ask Codex to create a plan.
4. Wait for the plan to complete.
5. Try to change the model before clicking Implement plan.

Result: the model selector is overlapped by the planning UI and cannot be used.

What is the expected behavior?

It should be possible to change the model after the plan is generated and before clicking Implement plan.

Additional information

_No response_