Trouble putting together a mixed reality scene with Obs and oculus rift.

Hello,
has anyone created mixed reality with oculus rift s, and unity?
I'm using the MRC scene from the Oculus libraries, 
but it's a bit confusing to set up an external camera.

In OBS I get the two cameras, 
but I have not been able to divide the image as it is done with quest 2.

I also follow this video
https://www.youtube.com/watch?v=p1c8D_l0upI

Any advice would be helpful
Thanks