Resizing tracks in Play mode

In Play mode, I have tried everything I can think of so far on the Mac to resize individual tracks for editing, but have not yet found a way to do so no matter where I more the cursor. I though I seen this done on a demo video. Obviously without being able to resize the tracks, the graphic display wouldn’t be much use since you would only be able to view and edit a few notes within the limited range at a time. Is there some kind of hidden shortcut for this?

I agree that it’s not obvious how to resize tracks, but it can be done. You have to drag the narrow column on the left. Unfortunately this is a limitation of the table control in the framework which means that other cells can’t be resized.