Hey, thanks for the detailed report with the screenshot and version. It looks like Claude Code and Codex are showing up under File Explorer, Outline, and Timeline without their own icon in the Activity Bar.
This is a known regression in 3.10. Cursor stopped registering the view-container that these extensions use for their panel, so their views fall into Explorer. Reset View Locations won’t help since there’s nowhere to restore the views until the container is registered. For the same reason, drag-and-drop and Move to Activity Bar don’t show up.
Good news, a fix is already done and is rolling out in 3.10.20+. It’s not in 3.10.17 yet.
Until you can update, the temporary workaround is to roll back to 3.9, where everything works like before.
Let me know if you need help updating. There’s also an active thread about the same issue: Codex extension disappeared from UI