Hover your cursor over the green "You are screen sharing" bar, then in the screen share controls, click More. Click Optimize for video clip. Start or continue playing your video clip.
Thanks James but that's not solving my problem. When I share a portion of my screen and record it no participants not even me as host shows. It only records what is showing in the portion of the screen shared. I am wanting to record both that shared screen along with me - my cam as the speaker/presenter.