How can I edit the course name once it is published?
I have had a look on the Canvas Guides and found this guide that should point you in the right direction, it will take you through how to change the Course Name (and that is OK to do even when the course is Published). How do I change a course name and course code?
The only thing I will note, is make sure you let your student's know, otherwise you might have some confused thinking they have lost their Course unexpectedly (depending on how much the name has changed).
I hope that helps!
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