Codex Desktop: new chat starter prompts are hidden in wide main-column layout, then appear when browser pane narrows the column

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

26.506.31421（2620）

What subscription do you have?

plus

What platform is your computer?

macOS 26.4 (25E246) MacBook Pro 16-inch, 2019 Intel x86_64 CPU: 2.6 GHz 6-core Intel Core i7 Memory: 16 GB GPUs: Intel UHD Graphics 630 + AMD Radeon Pro 5300M No external display

What issue are you seeing?

On Codex Desktop for macOS, the new chat screen does not show the expected starter prompts / suggestion rows under the composer when the main chat column is wide. The content appears to exist but is hidden or clipped behind the composer / lower overlay.

Opening only the left sidebar does not fix it. Opening the right browser pane, which narrows the main chat column, makes the starter prompts visible. After clearing render caches, the behavior changed slightly: the right browser pane alone is enough to make the prompts visible, but the prompts are still hidden in the wide main-column layout.

This looks like a new-chat responsive layout / reflow issue. The starter prompts seem to render incorrectly when the center column is above a certain width, and they become visible once the layout is constrained by the browser pane.

Steps to reproduce
Launch Codex Desktop normally.
Open a new chat.
Observe the center new-chat screen.
The starter prompts below the composer are hidden / clipped when the main chat column is wide.
Open the left sidebar.
The prompts are still hidden.
Open the right browser pane.
The main chat column becomes narrower.
The prompts become visible.
Expected behavior
The new-chat starter prompts should be visible immediately when opening a new chat, regardless of whether the main chat column is wide or narrowed by side panes.

Actual behavior
The starter prompts are hidden / clipped on the initial new-chat screen while the main chat column is wide. They appear after opening the right browser pane / narrowing the main chat column.

Tried
Quit and reopen Codex: still reproduces.
Clear the following render caches and relaunch: still reproduces.
~/Library/Application Support/Codex/GPUCache
~/Library/Application Support/Codex/DawnGraphiteCache
~/Library/Application Support/Codex/DawnWebGPUCache
~/Library/Application Support/Codex/Code Cache
After clearing caches, the issue still reproduces in the wide main-column layout. The behavior changed slightly: opening the right browser pane alone now makes the starter prompts visible.
Launching with open -a Codex --args --disable-gpu --disable-gpu-compositing: Codex bounces in the Dock and never opens. After force quit and normal relaunch, the new-chat layout issue still reproduces.
Relevant log clues
Seen in Codex logs:

[electron-message-handler] [desktop-notifications][global-error] ResizeObserver loop completed with undelivered notifications.
Also observed repeatedly, though this may be unrelated:

[Composer] failed to fetch ide-context errorMessage="Failed to get ide context: no-client-found"
Screenshots
Suggested screenshots to attach:

05-sidebar-open-wide-column-hidden.png - left sidebar open, wide main column, prompts hidden
06-wide-column-hidden-after-cache-clear.png - wide main column after cache clear, prompts still hidden
07-sidebar-and-browser-pane-prompts-visible.png - browser pane open, main column narrowed, prompts visible
08-browser-pane-open-prompts-visible.png - browser pane open without expanded left sidebar, main column narrowed, prompts visible

What steps can reproduce the bug?

Start a new conversation

What is the expected behavior?

_No response_

Additional information

_No response_