You can re-size a track so that you can better edit the sounds on the track or so that you can see more tracks on the screen at once.
Re-size a track by moving the mouse to the bottom of a track and drag up or down. When the mouse is in the right spot to re-size, the cursor will become an up/down cursor .
Alternatively, you can click on the "Track" menu > "Properties" > "Track Height" . Choose a size of Small, Normal or Large.
Resizing All Tracks
You can re-size all tracks at once by clicking on the "View" menu, followed by "All Tracks Height" followed by "Small", "Medium" or "Large".
To re-size all tracks to a specific size, hold the SHIFT key down, click down on the bottom of a track and drag up or down. When you release the mouse, all tracks will re-size.