The Live view shows both real-time video and voltage/current:
The Playback view shows previously recorded video/audio datasets:
On the left are controls specific to each mode. On the right, along the bottom, the three video streams are displayed in small video windows. Any one of these streams can be selected by tapping on it, and that stream is displayed full-size on the right.
Note that the close-up welding camera video includes the camera-computer’s menu bar with options. These menu items are just part of the picture and they will not respond to screen taps.
You can switch to the Playback mode by tapping the Go To Playback button in the upper left.