Hi @ajw13 ,
No, you will need to do this for each course individually. The only way you can do this globally would be if you are a Canvas Admin and have permissions to edit the feature options. If the feature option is enabled by default, that means your institution enabled it as a feature option for all your courses by default. You cannot do this as a teacher.
Notification settings and course feature options are completely different. Notification settings are related to your specific user account as a whole, but feature options are related to a specific course only.
I hope this helps!