I keep clicking play on Green Orange mode and the text in the bottom left changes to Entering: P1 but nothing happens. It says there's a second player as well even though I just want to play singleplayer. :(
I was having the same issue with my Xbox One controller. It seemed like somehow the game was using the controller for both the first and second players. For instance, while using the controller it would only let me edit player 2's control settings. I fixed it by going into the control settings and under "gamepad" setting player 2 to "no gamepad".