Would be nice to add an extra filter for a list of users (and potentially for a list of groups) on the groups page. See attached screenshot.

Rationale:
we sync a lot of groups to our courses, timetabled classes, enrolment type groups, and people can created many of their own. A lot of units end up with quite a few so management of them can be an issue. The core group and groupings UI just orders by name A-Z, which is ok i guess however, they can be hard to manage.