Sessions and devices
See where you are signed in, and end anything you don't recognise.
Profile → Security lists every active session with device and last activity. The current one is marked.
Revoking a session signs that device out immediately. Do it when you sell a laptop, leave a shared computer, or simply aren't sure.
If you don't recognise a session, revoke it, change your password, and check the audit log for anything you didn't do — then tell us.
Sensitive actions ask for verification again even inside an active session.