Hey, this is a known issue. The Secondary Sidebar doesn’t correctly support third-party extensions right now. Extensions like OpenAI Codex show up blank when moved there.
For now, the workaround is to use Codex from the primary sidebar (Activity Bar, left panel). The extension itself still works, it’s only the location that’s affected.
Main thread: Secondary Sidebar not supported
The team is aware. There’s no timeline yet, but your report helps with prioritization.