Codex Android tablet conversation layout is left-aligned on wide screens
What issue are you seeing?
In Codex within the ChatGPT Android app, the conversation content and composer are aligned toward the left once the viewport becomes sufficiently wide. This is especially noticeable on a tablet: a large unused area appears on the right while the rest of the ChatGPT app uses a centered layout.
The issue occurs in both portrait and landscape orientations. The app remains usable, but the Codex view is visually inconsistent with the rest of the app.
Severity: Low (cosmetic/layout inconsistency; does not block use).
What steps can reproduce the bug?
- Open ChatGPT on a Xiaomi Pad 8 Pro.
- Open Codex.
- Open any Codex thread.
- Use a sufficiently wide window or viewport in either portrait or landscape orientation.
- Observe that the conversation and composer sit toward the left rather than being centered in the available width.
This occurs in every Codex thread tested.
What is the expected behavior?
The Codex conversation column and composer should be horizontally centered within the available viewport, consistent with the other views in the ChatGPT Android app.
Additional information
- Surface: Codex in the ChatGPT Android app
- Device: Xiaomi Pad 8 Pro
- Android version: 16
- ChatGPT app version: 1.2026.181
- Orientations affected: Portrait and landscape
- Reproducibility: Every thread when the viewport is sufficiently wide
- Screenshot is available and shows the large unused area on the right.
<img width="3200" height="2136" alt="Image" src="https://github.com/user-attachments/assets/eb72694e-be31-4441-bd2b-12dde042383e" />