Stream Together. How do we both show our games in OBS? All we have is the webcam option

My friend and I are trying to do Stream Together. We both us OBS. We are playing DayZ.

When I add his game sources link, it shows his logo on a whiteboard.

Not his actual game. We both want to do split screen game to show both perspectives of our games.

How do we do that with Stream Together?

Thank you!