Solo’ed and Muted tracks are hidden when groups are collapsed, so you have to go hunting. An icon in the group headers would solve this problem.
What problem(s) would this feature resolve?
When you’ve got a lot of tracks in groups, it can be a pain to find where the solo or the mute is.
How does this feature fit in Bitwig as a product?
Better usability.
Is there already an alternative way to achieve this on Bitwig?
No
Could it be implemented using Bitwig components or APIs, without Bitwig team’s support?
No
Could it be provided by a VST or something else reasonably integrated with Bitwig?
No
Are there other products that offer this feature?
Ableton Live