I didn't see this mentioned in the manual, and it took me over a week with the trial to notice...
Being able to swipe on the trackpad to control the track panel makes it so much easier to use (I found clicking on the small arrow icons at the bottom really cumbersome).
- Swipe right when hovering over a track leader will display it
- Swipe left when a track panel is open will close it
- Swipe up/down over an open track panel will move to the track above or below