This feature enables Account Owner and Administrator users to control which contacts your users have access to.
It works like this:
Contacts can be assigned to a user and/or an office/location.
Users can be assigned to one or more offices/locations.
Users can have permissions set for each office/location they’re assigned to. These permissions control what type of access the user has for contacts that are assigned to that office/location (i.e. manage, edit, view).
Account Owner and Administrator users have access to all contacts regardless of office/location assignments and permission settings.