I discovered why you and others in Windows 10 are getting different results when trying to fit a 2D map to full screen. How well this works depends upon your display Resolution and the Scale and Layout setting in the Windows 10 Display settings page:
This is the best I can get on my 4K display with a 3840 x 2160 Resolution setting and the 300% recommended Scale and Layout setting:
but this can be improved markedly by using the 200% Scale and Layout setting:
So at present, I can either have a bigger looking map with text that is too big for all applications, or a smaller map with text that is just right.
Thus when your software developers consider this problem, they should be careful to test with different display Resolutions and Scale and Layout settings. It would be nice to see a contemplative implementation that works well across all combinations.
Now, while the result gets better by dinking with the Scale and Layout (at the expense of text size in all applications), what I really want is a true Fit function so the map just fills the screen as limited by X or Y which ever comes first.
I think most would admit that the maximum size map displayable with the recommended defaults for a 4K display is more than a little disappointing. DroneDeploy creates such wonderful data that I'm sure you want to display it in a way that shows off its greatness.