Just like layers in a panel, each video track renders over the video track below it in the Timeline view. You can change the order of video tracks relative to each other.
NOTE You can also move video tracks below the storyboard track, to make them appear behind the artwork in your storyboard.
How to reorder video tracks
- In the Timeline view, select the video track you want to move.
- Do one of the following:
- Right-click anywhere on the video track and select Move Track Up or Move Track Down.
- In the Clips and Tracks toolbar, click on the Move Track Up
or the Move Track Down 
button.
The track is moved up or down in the list of video tracks.