Video Window is gone

[Babsy]

Yesterday, I was using zoom to record a tutorial and didn't want my window to show up in the recording, so clicked it off via the actual box, not the video control in the bottom left. 
Well, now, I can't get it back. And, when I attend other people's zooms, my window isn't there at all. 
How do I get this turned back on, plz?? Thanks for your help!