Hi,
my reviewboard site is set up with "Standard Registration". I have set up an Authentication Group to grant some admin privs to team_leads. I can associate users with this group, but I have not found a way to disassociated them using the "User Page".
Selecting the greyed group and pressing 'Save" does not toggle membership.
Windows 10, Chrome, reviewboard 5.0.3. (same on 3.0.3).