When using screen sharing in Zoom gallery view, the web SDK used in iFrame is sometimes displayed in standard mode

Description
Viewers watch webinars using the Zoom Meeting Web SDK, but when using the gallery view and the host shares the screen, the camera view may appear right or at the top.
I would prefer that they always appear right, but what is causing them to appear at the top?
I am using an iframe in the Web SDK.

Which Web Meeting SDK version?
2.17.0

Screenshots