Log out all devices
a button that you can LOG OUT of all devices ( e.g.computers and phones)
If a computer have been compromised of a mobile device lost or stolen.
For peace of mind so you know all entry to your e-mail has been blocked.
Wouldn't changing your password accomplish the same goal? I've changed my password before and other devices have to then enter the correct new password.
Plus 2fa I don't see this as necessary
This would or should go with two factor authentication. After a device has been authenticated, then there should always be an option to remove devices