How do I stop seeing names of participants entering/exiting breakout rooms in the chat?

I host trivia events and the players join their teammates in breakout rooms after each round and each time this happens the chat lists all their names, line by line, when they enter and exit the breakout rooms which makes the chat almost useless because it pushes the actual text messages above the space that can be seen. How do I turn this off so the chat only displays the actual text messages that the participants type?