To enable Do Not Disturb (DND).
Click on your picture or the avatar on the top right to view all current settings.
The current settings are shown here.
Toggling the Do Not Disturb switch to enable this function.
DND - Do Not Disturb
This function will stop all calls from being received by this extension, not just this app.
A DND symbol appears at the bottom of the picture icon to indicate that your extension is now in Do Not Disturb mode.
To switch it off, reverse the toggle switch in the settings.