How to hide browser address bar when connected to my jitsi server

Hi there, I’m using jitsi on Ubuntu for our school. Students get into the meeting by clicking a button that takes them straight to the relevant room. But I would like to prevent them for coyping the link from the address and sharing it around (they do it just for fun, having friends pop into the room where they’re not supposed to be). How could I achieve that on my server?