To reposition a track, move
the cursor over a track until it changes to this shape
then click and drag
the track up or down the list and release.
To change the height of a
track, move the cursor over its lower boundary until it changes to this shape
and then click and
drag downwards (or upwards when possible) to change the height of the track.
Click this icon
to collapse the whole
Timeline down to just the Time-track and Playback toolbar. To restore it, click
the icon again.