One place in the menu for the people who do the office's work,
holding only what each of them may open.
People with an office role see a group named My Office on the full site. It is not part of the simplified view.
The administrator sees every office page. A role holder sees the areas the role grants. An approver on the grant chain sees the Grant Tracker.
A member with no office role does not see the group at all.
This is an optional feature, switched on when your network asks for it.