So I tried to enable sv_cheats, and this came up: " Can't use cheats now; please exit to main menu and start your own listen server with "map mapname" so that you could enable cheats." I went back to the menu and created a lobby. All I found was "Official Dedicated", "Best Available Dedicated", "Local Server" and "Steam Group Server". How can I create a Listen server? Is there anything I'm doing wrong, or something I have to do?