Regarding the "expand the Duo 2 in two windows" option:

On my NVR (RLN36 - Hardware N5MB01) I don't see a "Change the Image" button on the Duo2 camera page.
I see the "Spotlight" button, and then the "Sound Alarm" button and then the "Camera Settings" button. (There is no button between the Alarm and Settings buttons)

My Duo2 Firmware is 3.0.0.1033_22060900
My NVR Firmware is 3.0.0.181_220521629

There aren't any firmware updates available on the main page for either the Duo2 or RLN36.

I currently can't even SEE the camera in any multi-window view on the NVR --- only when I click for solo view of the camera.