go to your video and click the button with the three dots in the upper right hand corner. if you don’t see it immediately, hover for it to appear
a menu will drop down. scroll to the bottom and select hide self view
in the lower panel of your zoom screen there is a green button that says "share screen" - click that!
hover in the blank space by the video until a grey bar appears
drag the line until you see your person’s video get larger