Font size for some parts of the UI is too small, as shown in the screenshot (the setting window, and the layer panel). My device is Dell XPS 15 9560 with a 4K display.
It seems like a font missing issue that causes the font fallback onto the System font, which is a bitmap font and don’t support larger font size. Changing the UI font setting won’t help. I also tried to alter the DPI scaling behavior setting, but it doesn’t seem related.
I think that this issue happens after a recent update. Rhino worked just fine on my machine a couple of weeks ago.