How do I see active sessions and sign out a device?

Settings → Security → Active sessions — everywhere your account is currently signed in. Sign out ends one session; Sign out everywhere ends every session including this one — use this if a device was lost or stolen.

Trusted devices lists browsers where you chose Trust this device and are not asked for a 2FA code. Remove one to restore the prompt.

Recent security activity shows sign-ins and changes to your security settings.