The PDF Studio 2020.2.0 release has a new look! PDF Studio has been completely restyled to a more modern flat look and feel. The new design comes in both a Light & Dark themes and also provides enhanced 4K high DPI display support (especially on Linux).
NOTE: the new Light theme is now the default for NEW installations. To use the new theme after an upgrade go to Preferences -> Display and choose the theme you wish to use.