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Change preferences in FaceTime on Mac
Use FaceTime Preferences to set up or change FaceTime options. Additionally, you can add callers to a list of blocked callers.
In the FaceTime app on your Mac, choose FaceTime > Preferences, then click a preference pane:
Settings: Sign in to FaceTime, set up making and receiving phone calls, and change general options such as allowing Live Photos and ringtones.
SharePlay: Turn on SharePlay to allow apps to automatically start SharePlay and automatically join with people you’ve used SharePlay with before.
Blocked: Set up a list of callers from whom you don’t want to receive FaceTime calls on your Mac.
To learn about the options in a pane, click the Help button 
at the bottom of the pane.