Can you solve it? The Zoom puzzle

How the ubiquitous app places our faces

UPDATE: Solutions now up here.

Today's first puzzle concerns Zoom. For those of you who have been hiding under a stone all lockdown, it is a video-conferencing app.

1) Deduce the Zoom algorithm for placing four faces, using the three screengrabs below taken from three different people's computers during the same meeting. For those who have never used Zoom before, the yellow outline tells you who is speaking, and doesn't affect the positions. The fourth screengrab from the same meeting is above, but you can solve the problem without it.