Codex App: Edit Goal pane is covered by a blank overlay and becomes unusable

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

Version 26.814.41407 (6720)

What subscription do you have?

Unknown (the subscription tier is not shown in the app information available during reproduction)

What platform is your computer?

Darwin 24.5.0 arm64 arm

• macOS 15.5 (24F74)
• Apple M4, Metal 3
• Main display: 1920 × 1080 @ 60 Hz (non-HiDPI)

What issue are you seeing?

When Edit Goal is opened in the right-side pane, a large opaque blank/white layer covers the lower portion of that pane. The goal text is clipped underneath it, and the pane becomes effectively unusable because the hidden content and controls cannot be reached normally.

The left task pane continues rendering, so the obstruction appears scoped to the Edit Goal pane rather than the whole window.

What steps can reproduce the bug?

1. Open an existing Codex task with a long goal description.
2. Open Edit Goal in a right-side split pane.
3. Use a relatively short/wide app window (the captured window was approximately 1698 × 636 px on a 1920 × 1080 display).
4. Observe that the lower part of the Edit Goal pane is covered by an opaque blank area; text is cut off and the pane cannot be used normally.

Observed on August 21, 2026. Exact trigger may involve the split-pane layout plus limited window height.

What is the expected behavior?

The Edit Goal pane should remain fully usable at this window size: long content should scroll, and all editor actions/controls should remain visible and clickable. No blank layer should cover the content.

Additional information

This may be a regression related to #18341, which was closed as resolved, but the environment and presentation differ:

• This occurs on Apple Silicon (M4), not Intel.
• It occurs on a standard 1920 × 1080 display, not a HiDPI/4K scaled display.
• The obstruction is a white/opaque block limited to the Edit Goal pane.

Screenshot source (unlisted gist): https://gist.github.com/Dory123456/8416d7584016e0d946323bac846f0c55

Reproduce the Edit Goal pane issue using a long goal, a right-side split pane, and a short/wide window around 1698 × 636 px on macOS. Start by locating the Edit Goal pane and split-pane layout implementation, then compare the regression context in #18341. Done means the goal content scrolls and all editor controls remain visible and clickable without an opaque overlay.