Enabling Live Follow allows for the camera shots to follow the movement of the object they are tracking, such as a person's face. It's ideal for a situation in which you have 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 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 go from gray to white.
If you would rather keep your shots static to a specific area, turn Live Follow off.