When filtering course enrolments by group, the selected filter is wiped if you unenrol a student. This means that if you want to remove all students within a group (eg a year cohort or rolling membership) you need to reapply the group filter EVERY TIME you unenrol a user so that you can identify the other relevant users.

Expected action - after unenrolling a user the screen refresh should take you back to the settings or filters that you had previously applied.