How Do I stream using obs and Seemusic?

I see Seemusic have an obs virtual camera integration but I don't know how to use it. I want to stream in twitch showing my live performance while I play.

As you see ,in the first picture I used the obs option

But when I go back to OBS the piano is not there.

What do I have to do to see the whole thing in obs, because if I choose start transmission, it won't show nothing but the fireplace video and I want when I start streaming or recording, showing the whole setup.

Thank you!