I was wondering if there is a way to make the rest of the course material unavailable during the quiz. I suspect that some of my students were cheating on the last quiz when one of them came up to ask a question and I noticed that the lecture material was open in another tab. I was hoping to be able to lock down the lecture material during the testing period, so that they can't copy the material during the test. I also don't want to be looking over their shoulder the whole time to see if they are cheating. Some of my classes are online only, so I can't even see if they are cheating. Any suggestions to make the course material unavailable once the test has been opened?