Hi,
Prepare to have different rules every time you take the exam because it seems each proctors has their own set of rules.
Some just start the exam while I'm still holding my phone in my hand without even contacting me. And with others they complain about the wooden box that is below my monitor to set it to the correct height and make me remove it and then complain 10 times that I'm not always in the view of the camera.
The most annoying session I had was when I was not allowed to use my laptop (closed) in my dock and use my monitor as a screen (which is my normal test taking environment). I had to use my laptop so I was bend and way to close to my screen for 5 hours (yes I also had a lot of technical issues that session)
So be prepared for the unexpected. And make sure you have time after your exam appointment because if there are technical issue during the exam then it might take hours longer then the exam time.
Note to people in Europe: if you take online exams with VUE your aren't buying an exam but an online service. So you are taxed for an online service and not for an exam. That will make online exams with VUE more expensive then the location exams in some European countries (like for example in The Netherlands)