Should it not be the most recent modification group for items in the group?
More description below:
I have a folder / group of sub-groups, files within sub-groups, like so
group a -- sub-group a1 -- a1f1 -- sub-group a2 -- a2f1
If I edit a1f1, the modified date of a1 does not appear to change.
Would like to be able to sort a1, a2 sub-groups, based on whichever sub-group has the most recent modified file.
Could not find the answer in the discussions here, nor in the help.