The testing app shows you your video stream in real time, it's relatively tightly zoomed and cropped to your face. This is what leads me to believe that they rely heavily on eye tracking (and sound, they require that your mic be capturing too) to look for suspicious behavior. I'm not sure, because it's never happened to me, but I believe the proctor has the ability to interrupt your test and request that you show them the room.

The requirement is that you remain in place and keep your face on camera for the duration of the test, but depending on the test there's an "unscheduled break" functionality that will let you take an unsupervised break, at the cost of locking you out of all of the questions you have already seen on the test so far.

Pearson OnVUE: https://www.pearsonvue.com/us/en/test-takers/onvue-online-pr...

Microsoft-specific documentation of the online testing process: https://learn.microsoft.com/en-us/credentials/certifications...