If your teacher already knows you you can also switch off your camera. That way you don't have to worry about what he's doing and he can't see your face. Or you can also adjust your camera to where you don't have to see everybody else's faces just focus on your teacher. Look for settings that allows you to do that or just ask your professor how to do it if you don't know the settings of your software or program you are using.
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No, obviously. I felt like switching off my camera but then would be weird since the whole class switches it on. Don't know why would he do as such