I can see there is a way to expand all groups, and then a way to undo the expansion. However, I don't see any way to collapse all groups, which would be useful.
collapse all closed (i.e. with no windows open) nodes would also be good
It's been 7 years.... It would be REALLY NICE IF WE HAD THIS DECENTLY-BASIC FEATURE BY NOW!
Customer support service by UserEcho