DaveNicholls on Nostr: I can't understand how to create a private permanent room. I am using the rooms for ...

I can't understand how to create a private permanent room. I am using the rooms for classes, so I'd prefer not to be disturbed. I have just made a private room, but it appears on the 'Active Rooms' on the Hive Talk front page, so I can imagine someone walking in on the class.