Select the badge with your photo or initials, then Switch Session.
The button might be named "Lock Session" if no other session is active on your device.
You will then be able to choose an active session or add a new one.
You can quickly access your locked session using your PIN.
If you choose the Log Me Out option, your session will be completely disabled on your device.
After such a deactivation, the next time you want to log in on this device, you will need to provide your email, password, and confirm your identity with a security code received by email or SMS.