Currently, only an Admin can see all locations without actually being assigned to any of them. Therefore, they don't need to be listed in Manage > Staff.
Non-admins currently do need to be assigned. Businesses with a remote CX team then have to assign them to all locations, but can be confusing for franchise owners who have a new location and over two dozen staff assigned to it when they don't actually work AT that location.
It would be great to activate a user to have permissions to see all locations while NOT being an admin.