canvas capture

Out of curiosity, and to ensure I minimize the amount of post-production work I have to do, when broadcasting and/or recording using OBS, am I correct is saying that the ONLY output from OBS is what appears within the confines of the Canvas window? Irrespective of resolutions chosen? There's no...

I am not a coder, but I was wondering if there might be a way to capture the canvas itself in any paint program with OBS. If you try to do this with Window Capture, OBS pics up everything including Zooming in/out and Rotating. I'm wondering if there is a way to capture the canvas itself...