Magewell Director Mini - 4K Source - Crop to 1080p Test?

I'm hoping that given a clean 4K source image over HDMI that the Magewell Director Mini can Crop and present 1080 sub images screen. That seems to be possible, but it's not clear to me of I'm actually cropping a 4k source or not. What do you think?

[@TheOutdoorsStation]

Thanks for taking the time for a real world demo. You are asking useful questions which need answers.