Open FaceTime
Start or join a call
Tap the screen to show call controls
Tap the screen-sharing button
Choose Share My Screen
Confirm if prompted
Open the app or screen you want to show
To stop sharing, tap the screen-sharing button again
Select Stop Sharing
To control your own screen display, rotate the device or adjust brightness and volume
To mute audio, tap the microphone button
To turn off video, tap the camera button