Hi
I don't think you are doing anything particularly wrong. Unfortunately VP wont expand multiple tracks much. The best you can do is to click the + at the left end of the track where this is present when it will change to a - and the track will enlarge. (Audio Track 1 and Video track 1 are full height by default)
You can further increase the height slightly by grabbing the five dots between the Video and Audio tracks and dragging them up. You can do the same with the dots under the preview window. If you particularly want to use just the audio tracks then you can click the - icon for the Video tracksto reduce the heights and continue to pull the audio up. You can probably work with about 5 tracks then but the video thumbnails are then miniscule as will be the preview window which might need to be undocked. You will need to play around with the controls a bit to get the best effect. If you want to match peaks you can of course zoom it to the audio.
Nat