There's 2 ways, you can have a PS4 Controller with DS4 Windows and control them that way, or you can connect your controller via Bluetooth and assign player 1 to it and connect your controller via USB and the game will think you're using 2 controllers.
@@yoanrichard If a player dies, the damage multiplier that is set for the players is set back to 1 instead of 0.5 (Which player damage is halved if both players are alive).