How do I create a lobby server for a multiplayer project?

Now, I have read blackhornet's tutorial of the tic-tac-toe game and I have read all the entries in the multiplayer tutorial by Ashley.

There is something that I seem to be missing, though. If I want to create a lobby on one layout, and the actual game on another layout, then the lobby server would only be the host of the lobby room and none of the actual game rooms, right?

I have read some answers to my question and someone mentioned "client versions" of the game with "host events disabled" (https://www.construct.net/en/forum/construct-3/how-do-i-8/create-multiplayer-lobby-145489), would someone kindly explain how that works?

All answers are greatly appreciated, thank you.