I have a Windows 10 host with a high DPI screen, 3840 x 2160, and when I run VirtualBox on it some things scale and others don't.
For instance, the font in the guest are correct, but the mouse is too small almost to see.
The fonts in the VBox management console are too large and overlap. Also the menu hosting the guest window is sometimes too small, and other times too large and overlapping itself.
This sounds like a small issue, but it happens to other fonts, controls within VBox as well to the point of not being usable. For the moment, I'm going back to a much older laptop so I can see what I'm working with, but I'd much rather run virtualbox on the new system.
This gets much worse when working with multiple monitors if they do not have the same resolutions. However, I haven't found any other application with these issues.
Thanks