The Admin Tab allows or restricts the ability of Community Admins to modify the Theme, Colors, and Images on their Microsites. The page is only visible to HLAdmins.
The three areas of radio buttons and checkboxes correspond to the functionality found on further steps of the wizard. The "Allow Layout Changes" area corresponds to the Layout Tab. "Allow Custom Colors" and "Allow Advanced CSS" impacts controls found on the Colors Tab. "Allow Images" settings impact the Images Tab.. Clicking the "Next" button for Site Setup area wizard opens these tabs where the permissions established will be reflected.