When I launch ArmA 3, about 70% of the time it looks like it has zoomed in about 5x. I cant see any options or much besides color. It may have to do with resolution because when I exit Windows tells me I was not using the right resolution.
When I first launch it shows the small ArmA 3 loading addons visual. After that its black, then a few seconds later its white. When I Shift-Tab for the Steam overlay it is similar plus i see a cursor that is very big.