Enabling Live Follow allows for the camera shots to follow the movement people's faces. It's ideal for situations such as a speaker walking around a stage or a chef moving from one side of a kitchen to the other.
If your subjects are staying fairly static, such as a panel discussion or a meeting, we usually recommend disabling this feature to prevent unnecessary short movements of the camera shot.
If you go to the More Options menu and tap the Camera Assistance icon, you will notice three options: Find Faces, Live Follow, and Auto-Pilot.
Tap the button to turn it on; it will change from gray to white.
If you would rather keep your shots static to a specific area, turn Live Follow off.