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in the menu bar on your Mac, click Switch, then click Join in the FaceTime window on your Mac Studio. To hand off a FaceTime call from your Mac Studio to your iPhone or iPad, tap 
Use your iPhone as a webcam on your Mac.
Use FaceTime with a group. You can connect with up to 32 people in a group call. Make a unique link to share with a group. Click Create Link. Copy the link to your Clipboard or share directly with friends in Messages or Mail. You can now use a link to join FaceTime calls on non-Apple devices.
Note: Your Mac Studio and iPhone must be connected to the internet and the same Wi-Fi network in order to make or receive calls on your Mac. An external microphone is also required to make or receive calls on your Mac Studio.
Learn more. See the FaceTime User Guide.