As a site admin, you can control which roles are able to see the "Members Tab" when viewing a group space as either an admin, member, or guest of that group space.
Site Admins can go to Site Administration > Site Modules > Groups, and use the checkboxes there to select which of your roles (Faculty, Parents, Students, etc.) should be allowed to view the class rosters when viewing class pages.
Deselecting this checkbox means that members of the corresponding group will not be able to see the "Members" tab on class pages.
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