Editor only spawning one playercontroller despite number of players selected

At first I thought it was a problem with my gamemode but even with default gamemode, only one playercontroller is ever spawned. I reverted back to a previous version of my game and still the same. I then booted up the content examples project and tried that with 2 players and again only one playercontroller is spawned. I’m not sure if I accidentally changed a setting or what but something is not working as I expect it to.

I have a theory if someone could confirm or deny: does the world outliner only show PlayerController 0? I.E. is the world outliner a client’s view rather than the server’s view?

I think so because if you look in Outliner in PIE at the header it says “CLIENT 1”