My laptop screen resolution is 3840x2160 in a 15.6" screen. Other apps scale the font size correctly. However, Zoiper is tiny. I would like to use Zoiper, but the lack of font scaling makes it unusable. Perhaps if there were a hi-res skin, that would probably suffice. Thanks!
I am using Zoiper 3.3.25608 64-bit on Linux Mint 18 Cinnamon.