In one of my classes, I apparently and somehow unknowingly created Assignment Groups. Now I don't want groups, just the assignments that are within the groups. The problem is the Groups have created an extended grade book where the Assignment titles (Week 1, Week 2, etc.) are listed in columns after the weekly assignments with graded content, and they indicate something "missing" to students. Is there any way I can get out of these groups, delete the empty Assignment labels, and shorten my grade book?