Currently, when a user changes their display name in Canvas, their display name will only show up in discussions, announcements and conversations/Inbox. Their full name still displays in gradebook, course roster, and in student groups.
When a user changes their display name, that name should display everywhere in Canvas. In the gradebook, the instructor should have the option of using either the display name or the full name when they open it. The student should see their display name and other students should see their display name, as well.