Remove (Or Hide) Built-In Materials

Cura Lulzbot Edition comes with a wealth of prepackaged commercial material info. Unfortunately, exactly none of them are actual brands and materials that I use. So I add my custom materials to the materials manager, sure, but that’s just one small part of a huge menu full of things that are useless to me. Can I remove or hide the built-in “Generic” category of materials, so the menu only shows my “custom” materials?