Mini Monitor 4K Scaling

So in one of my suites I decided to try out s Mini Monitor 4K. If all you work with is 16:9 1080, or UHD everything is fine, but if you have a different aspect ratio the output is squashed in Premiere. For example we often shoot in 2:1 or 2:39:1 aspect ratio. so our Frame sizes can be 3840 x 1920, or 3840 x 1605. When creating a timeline with these resolutions it squashes the picture horizontally and sets the output of the card to 1080P output. Any Ideas the interface inside of premiere is pretty sparse.

Kevin