Device Management. In Settings > Devices you can see all the places where you are logged in.

Tap Link Desktop Device to quickly log in on Telegram Desktop or Web via QR Code.

Select an individual device to choose whether it can accept incoming calls or Secret Chats – or to log it out remotely.

All devices can also be set to log out automatically after a certain period of inactivity – ranging from 1 week to 1 year.