If you have your own server, you could try to adapt this trick
To have this as an options, you could try to use 2 different domains. It would be a bit clumsy though
Edit: or possibly try to use the iFrame API way, in the same thread I linked to. It may even work with meet.jit.si who knows ? No warranty.
this is not hiding the participants to each other, it aims to have everyone see the moderator’s screen. It’s a presenter mode, yes. If the moderator chooses so, the other users won’t see anyone else. If the moderator displays another user, everyone will see this user. If the moderator switches to tile mode, the users will see each other though.