From inside the Dashboard of a campus, you can switch to any other campus dashboard if needed by clicking the top drop-down arrow at the top left-corner of the screen.
Screenshot below displays the list of different campuses in a dropdown 
The list of campuses appears on the drop-down to switch from one campus dashboard to another.
Note: Inside any module, if you change the campus, then you will land on the same screen of the changed campus. For example, if you are currently on the building display screen under the Building Plans module of Campus A, then when you change the campus-to-Campus B, then app will display the building display screen under the Building Plans module of Campus B.