Local Multiplayer Control issue, Can't use Keyboard and Gamepad

I’m trying to use Local Multiplayer/Splitscreen by enabling it in the game settings. I want to have one player controlled with keyboard/mouse and one controlled by a Game Controller.

How do i go about doing this? As of now i plug a gamepad in and plug the keyboard in and they both controller the top player. I literally have NO clue where to even start with this.

A quick way to do this is to plug in a second controller. Player 1 will be controllable via the keyboard and controller 1, while Player 2 will be controllable via controller 2.