I lost recorded grades from one section after cross-listing. I emailed canvas support, and they sent me detailed instructions on de-cross listing a course. Understanding that I would lose the new grades that had been entered into the cross-listed gradesheet, I printed hard copies so that I could enter all grades at once. Unfortunately I am not able to de-cross list: when I follow the instructions, I am only able to "cross-list" or "re-cross list"--de-cross list is not a menu option. If someone knows a way to circumvent this, it would be a great help.