When I do into the existing master course and edit the title, it doesn't edit the nickname on my dashboard.
Hello Lizzie Amick Welcome to the Canvas Community. You are correct. Assuming that you are an instructor at your school, if you go to your course "Settings" page to edit the course name, it does not change the nickname that you may have given your course. The course name in "Settings" is different that a course "nickname" which you can customize via your Canvas Dashboard. Using this Guide, How do I view my favorite courses in the Card View Dashboard as an instructor?, you can see how to give you course a nickname via your Canvas Dashboard. If you were to remove that nickname completely, then the course card on your dashboard would default to the name of your course displayed via your course "Settings" page. You can see if your course currently has a nickname by clicking on your "Courses" >> "All Courses" screen. You should have a column for "Nickname" where you can tell which course(s) you've given a nickname.
I hope this information is helpful to you, Lizzie.
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