If you manage your locations with location-specific Positions, each manager can easily filter the employees or schedules by which positions/locations they are enabled to work.
In the top right of the screen is the Positions drop-down menu, where you can select the position group (location) to view. This will filter out the other locations and just display the one position group.
Managers can select the position related to their facility and only see their own staff and schedule.
filter out the other 2 locations staff so that they are only seeing their staff and schedule