When I go into the style configurator in Notepad++ and change the theme to something darker, like obsidian or monokai, all of my R files are monochromatic. In the default white theme this is not the case. Why is this happening?
In Style Configurator, check to see that Language is Global Style, Style is Global override, and everything is unchecked. That should make it work, then go from there. (Tested on a fresh Notepad++ with Obsidian and Haskell.)
Edit: Turns out R is not in by default, so this adds in syntax highlighting and more.