How do I match players to room in Photon?

I've built a multiplayer game, works well. On the login screen there's a checkbox. I'd like actors with checkbox to join rooms only with other actors who have checked the same checkbox. And opposite of course. Rooms should only have players with the same login checkbox state.

I thought I could set properties of rooms on join but I can't find any examples of how this could work (Photon examples in Construct are rare it seems)

Any help please?

Thanks for your reply. I had read the photon docs multiple times, but the C# code examples don't translate easily to C3 to me. I see in the examples how custom room properties are set and listed in the lobby, as in below:

The way I interpret that image is that on an actor first joining the room, the room properties "level" and "score" are set, then exposed in lobby, but I dont see how another actor joining the lobby or room can be made to check which rooms have that property before joining the room.

I'm hoping that for my project, an actor creates a room, can then set the property "checked" on the room and lobby, then I can for subsequent actors, have a condition "if checkbox checked", join room with property "checked".

Maybe I misunderstand whats going on.