Besides the 3 employee roles (Area Admin, Workspace Admin and Account Admin), there are further subdivisions that define which rights an employee has in the duty roster and task calendar.

In the Account settings → click on "Locations" (building) → click on the name of the desired location → here you will see a list of all employees assigned to this location

Here you can determine, for example, whether an employee can be assigned to shifts in the location, whether they can create their own shifts or whether they can see the tasks of all colleagues in the calendar.