This post has been marked by the post author as the answer.
MAX creates a separate place for user files to be stored. It's located at:
Documents>GameGuruApps>GameGuruMAX>Files
This is typically where all of your custom files end up. Try looking there to see if the folders you want to get rid of are there.
Intel i9-10900K 5.10GHz, 64 GB RAM, Nvidia GTX 1080 ti 11GB, Windows 10 64-bit, dual monitor display