I like to group all kinds of things by Group. While it appears to be an
option with Custom Forms, it's not a true Group ownership. I've been
using the Share function to grant Groups access to Custom Forms as
applicable, which works at the surface. If a form, though, has no Group
access assigned, the "Group" appears to default to some sort of
association with the creator. If that creator moves Groups, the form
doesn't follow. This makes it difficult to track who and how Custom
Forms are managed.