Hi
I have the same problem as you.
If I connect to my desktop from macOS VMWare Horizon Client (5.1.0) - the Windows desktop stays in 1920x1200 and looks crappy.
If I do the same from Windows 10 (running in Parallels 14 on mac) 0 the remote Windows desktop is displayed in native resolution of 3840x2400. With 170%DPI everything looks sharp.
For me it looks like bug in the macOS version that must be fixed.
@VMWare team: If you need more details for debugging - let me know.
best regards
lukas