It looks that all the pain with WinBox and high-dpi-screens is gone with the latest Update of Windows-10.
Microsoft introduced a new scaling technique that will make WinBox look good at other than 96dpi/100% display scaling settings.
Have a look at the images below.
- right click two times on the Winbox in your Taskbar, then left click “Properties”

- The Properties dialogue appears. Select “Compatibility”. Choose the scaling option “System (Enhanced)”. Click Ok.

- Start your WinBox. Et voilá! It is scaled properly.
