how to rotate dreams in deskscapes? using portrait mode monitor

Hi, I just got some new monitors and now I have one off to the side in portrait mode.  I can't seem to find a way to rotate the dream so that I can fill the entire monitor without blowing out the image.  

I know the image would be sideways, but I've been looking for some more abstract ones that aren't oriented in any specific way.  

Any advice appreciated!

Thanks

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