Tap the Phone app icon from the Home screen while on an active call, or tap the full-screen video display during a video call to show the Call Control screen.
The current active call is shown in the center of the screen. If any additional calls are on hold or connected to a conference call, they will also be shown; tap a call to make it active.
After a video call is established, full-screen video will be displayed. The image from your local camera will appear in a picture-in-picture inset in the upper right corner of the display.
Control icons are shown in the lower right corner of the video screen.