The interesting thing here is I cannot seem to replicate the issue. When I create and start a new GoGuardian monitoring session, then go to one of my test student chromebooks, no matter how many "desks" I open, GoGuardian still displays the "active" one the student is on.
I cannot "hide" from being monitored by creating a new desk.
So far, the only way that I have been able to hide as a student from a GoGuardian monitoring session is to turn the wifi off on the chromebook. But I still wonder if my students have found some other way. Trying to get one of them to fess up is never an easy thing.