Configure call forwarding in the Reachability area.

Here you can deactivate app calls without having to log out completely. A banner appears in which you can reactivate the calls from anywhere in the app

Here you specify when and where you want to forward incoming calls. Calls can be forwarded immediately, with a delay or when busy. Whether a forwarding is active is shown in the menu on your profile picture. Further information can be found at 10 Call forwarding.