I found this: Fusion 8 + Windows 10 Unity mode messed up window borders when I did some light searching first, that's Fusion 8, I'm on 10 though, is there a fix for this?
I also had Fusion 8 and it didn't work either, upgraded to 10 hoping it was fixed but still isn't or most likely I'm misconfiguring something. I tried disabling the window shadows in Windows since clearly Fusion or macOS are adding their own, but it doesn't work. I've disabled and enable 3D acceleration, the retina options, changed video memory sizes and I can't get it to work.
When I took the following screen show a new artifact appears now, it's a nice thick black border where the padding used to be but only if the Windows' window is drawn in the macOS "area" if it overlaps a Windows zone it shows the padding.
I installed one of those apps that goes against OS' conventions and draw what it pleases, Opera here, but it reacts in the same manner.
I queried the help section but nothing relevant appeared, any ideas?
Thanks!