I think I really need to read the manual in more detail, because both of your answers went way over my head, and my current level of understanding. I will try to explain in more detail, what I'm trying to achieve. Basically I want to use OBS as a giant TV teleprompter, scrolling my lyrics as I perform a song "Live", capturing both the vocal mic and my guitar into my Audio computer, in a different room. Behind me is a green screen, for chroma keying in Post-Production. The camera is recording that, so I don't need OBS to capture that. I just need to be in Projector Screen mode in OBS to see that I am centered in the shot, and the scrolling lyrics are full size and full screen. The small frame in the bottom left corner is zoomed in on my lead guitar playing, and it would be lovely to capture that in OBS in full screen, to later bring in to the Post-Production chroma keying project. So, if your answers are explaining how to capture that small screen in full size, then that is exactly what I'd like to do. I will re-read your answers, and run some tests. Hopefully eventually it will sink in. Thanks for your help guys!