iOS Zoom app automatically re-orienting when participant is moved to a breakout room

[incusmalleus]

I have students on iPhones that have their phones mounted horizontally (landscape) as an exam proctoring device. When I open the breakout rooms, their video feed gets re-oriented to the vertical (portrait) position. Even if they have the device's orientation lock fixed, it still gets re-oriented. The solution we do is for iPhone users to mount it vertically, but that limits the view. Any solution for this?

[markToC]

Is there a fix for this issue? It happens every time an iPhone user enters or leaves a breakout room.  Therefore, they must use portrait mode.  The result is a lot of wasted space that doesn't look attractive during a recording.