Quick answer
Install, verify, switch, and restore a custom Codex Desktop theme on Apple Silicon or Intel macOS.
Before you install
Launch the official Codex app once, download the complete theme pack, and confirm the package includes both install and restore actions. Keep the pack in one folder while installing.
Apply and verify
Run the macOS installer, approve only the clearly described local actions, then open a home screen and a normal task. The sidebar and composer must remain fully interactive.
After Codex updates
Visual layers may need to be reapplied after an app update. Never weaken the app signature or edit the application bundle to make a theme persist.
Compatibility note: Native Codex appearance controls and advanced visual image layers are different. Get Codex Theme labels the delivery path and never treats an experimental visual layer as an official Appearance feature.