I see U8glib listed in sketch>include library. When I clicked on it, it was added to the code as #include <U8glib.h>, which is what it's supposed to do from my understanding. I am using Arduino 1.8.5 (Windows Store 1.8.10.0). Don't know if it matters, but the U8glib file I installed from the library manager is version 1.19.1