+1 !
Here's how:
just *double click* in the piano roll anywhere in the empty space to move one level up (levels are: current track, all tracks in a folder, a nested folder, all tracks in the arrange).
This way you see events from many tracks at once (in track colors).
double click any note to see only this track (in one track view, notes are color coded by velocity or by midi channel).
you could also select multiple events from different tracks and then double click to display only these tracks (or use a keycommand).
Proven and very quick to work with, used in Logic since early 90s
.