Recording with camera image full size in final video

[WarrenGD]

When, a few months ago, I used to record a 1 participant meeting of just me practising speaking into my camera, I used to have the image of me small on the screen, and the video came out with me full size.

Now when I do the same thing, I get a video that is mostly black with a tiny video image of me in the middle.  If I make my video image larger, then the size of me in the resulting image is also the same amount larger.

How can I go back to having the video being the camera image fullsize, even if my previous window is small?

I've played around with various video settings but can't seem to find anything that works.

Zoom version 6.2.6 (41824).

MacBook Pro running Version 14.5 (23F79).

Can I get the old behaviour again, or is uninstalling and from somewhere installing an older version the way to go?

Many thanks in advance.