Gallery View on Android Phone

[Ahsanayoga]

I teach classes over Zoom using my Android phone. Recently the Gallery View format changed from "Brady Bunch" format (up to four faces on the screen; first page was me + three students & remaining pages each showed four students). Now the students are in a horizontal line & my image is floating (see image)

, similar to when there's only one student; their image takes up the entire screen & mine is smaller and floats over their image (hope that makes sense). So my question is ... How can I get back to the old format? Yama for any help!