Make webcams larger
Any user can resize the ratio between the webcam strip and the presentation area in their own view.
Any user can adjust the ratio between webcams and the presentation area (which may also be showing a screen share). The change applies only to your own view — it does not affect what other users see.
To resize, hover over the border between the presentation area and the webcam strip until a resize cursor appears, then drag down to enlarge the webcams and shrink the presentation area.