I’m one of those maniacs who hates the Office 2007+ / Windows 8 “ribbon” interface on programs.
I consider that on a wide screen, where width is surplus and height is lacking, using an interface where up to a third of the height is filled up with useless huge buttons (which can very well sit in menus or context menus) is just stupid.
Thankfully, FoxIt Reader (still) offers the option to return to the old non-“ribbon” toolbar mode. Simply navigate to View » UI Options » Change Toolbar Mode and select Classic Toolbar Mode. Restart the application to apply.