Sizing for desktop web app on mb pro retina

I’m designing a desktop web app using 1920 wide frames. When I go to present mode at 100% there is a small square in the middle of the screen. When I fit to width everything is huge. As I workaround I had to enlarge body fonts to around 20 but obviously this is not ideal as the design is inaccurate. I can’t get the sizing of anything right due to this. Using a MB Pro Retina 15. Can anyone advise what I am doing wrong?!

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