Landscape orientation does not work in iOS
description
Back buffer, graphics device viewport and window bounds are always set to portrait mode, regardless of device orientation.
I would expect to be able to set the device orientation and my own back buffer width and height and then have monogame scale the final output properly on to whatever orientation and size the device's back buffer is. For example, on iPhone, I would probably choose a 960x640 back buffer size with landscape orientation, and would expect mono game to return the correct landscape values for viewport, window bounds and back buffer. If my game was running on a non-retina display, I would expect mono game to scale the final render down to 480x320.