I have a midi track with multiple midi tracks in it (put on top of each other), and I want to do actions on the track so that it applies to all of midi tracks. For instance, with cut (s), I want to cut all the tracks at once, not only the top most one. Or when I want to copy, I want to be able to select the whole stack of tracks, and again not only the topmost one. Is this possible in Ardour 6?
The easiest is probably to switch to “Layered” display mode - see The Ardour Manual - Track Layering and then select all regions before making a change.