Option to turn on/off themes or whole extension entirely

Hi, so many teachers at my school are doing a sort of crackdown on better campus because they don’t like us having colorful themes while we take online tests. Every time they need us to do this, I have to uninstall and reinstall better campus. Is there any way to just like turn off better campus but still have the extension? Even just turning off the themes so it reverts to normal coloring would help because I think when you turn off themes it is a black background (especially what my teachers hate lol).