How do I lock a multiplayer room?

The option to lock a room exists if it has a maximum number of peers connected, but there is no action that does something like that.

Also, I didn't find an action that would allow me to change the maximum number of peers after creating the room.

Is there any way I can do this without a player connecting to it, receiving data, and only then getting kicked?

I vaguely remember running into this issue recently and I don't think there was a simple solution.

The most straightforward way was to migrate to a new room with the proper number of peers set. Use auto join for matchmaking lobbies only.

This is the problem ;( I want to use auto join, but I don't want the player entering to a locked room, even if they don't have the maximum number of peers. Or that I can at least set this maximum number after creating the room, as is allowed using Photon.

Maybe there is some solution using Script.

Is there any way I can check the native multiplayer plugin code?

Is there any way I can check ANY native plugin code in Construct?

The source code behind built in plugins are not available to be modified.