Use the controls (Figure 27) in the track controller at the far left of the timeline on each track to adjust the track height and re-arrange their order.
To adjust the height of a track, use the arrow buttons on the track. Click the down arrow to decrease the track height; click the up arrow to increase track height. This can make it easier to manage clips and other elements in your timeline.
To re-arrange a track’s position, select the track position handle and drag the track up or down in relation to the other tracks on the timeline and drop it in the new position. This allows you to move all of the clips, rather than moving one clip at a time.