How do you delete chats on the zoom app?

Hello,

there are "chat" meetings scheduled on my app. I did not create them and there is no way to manually delete them. I don't know what they are, why they're there, or who added them to my schedule. I tried uninstalling the app on my Mac desktop and then installed a fresh Zoom app. They showed up there as well! How do you get rid of them, please? Anyone else have this problem? Thanks.