All of your user files are kept in:
Documents>GameGuruApps>GameGuruMAX>Files
From there, if I want to completely get rid of a project, I go into
mapbank to delete any of the level maps I no longer need and
projectbank to delete the actual project.
Intel i9-10900K 5.10GHz, 64 GB RAM, Nvidia GTX 1080 ti 11GB, Windows 10 64-bit, dual monitor display