I can see this is a follow-up to your earlier thread, where @jaismith shipped a partial fix in v2.5 (plans only steal focus when you’re focused on the generating chat, and plan editors retain scroll position). Sorry that the broader agent-completion focus-jumping is still happening on v3.0.13.
This is a known issue that our team is actively investigating. There’s no setting to disable this behavior at the moment, but your suggestion for a cursor.agent.focusOnComplete toggle is noted.
I’ve flagged this thread with the team so they have visibility on the persistence of this issue.