I use a lot the Matrix Editor.I’m watching it would be great that for identify the group by each pattern may be another slightly different symbol to rectangular for clearly differentiate from each track.
Currently, the track and the group are identified by the same rectangle. Some examples:
Would also be possible the Collapsing Groups in Matrix Editor (with a command of keyboard or a icon).
In many cases, the boxes are empty groups. And when the zoom is very large, they take up much space. The groups do not contain notes, and information is little noticeable when there are effects.