@JessicaWestfall ...
I am sorry to read that you feel my response from October 2021 doesn't help to answer the question. I reviewed this conversation, and I believe what I've stated still holds true. If you read my earlier posting (above) from July 5, 2021, I indicated that turning off the Canvas Inbox is a discussion you'll need to have with your school's Canvas administrator...as your assigned Customer Success Manager team would need to be involved. The idea that I linked to in October 2021 seems to now have a different title:
Make the Inbox an optional feature (faculty already have emails!)
To be clear, this is an idea that has been submitted by a fellow Community member, and you can subscribe (follow) to the conversation so that you'd be updated when anything changes about that idea (just click on the three dot kebab icon at the top right corner of that page, and click "Subscribe"). I understand that this idea has been out there for a couple years now, and I know it can be frustrating when ideas we submit don't get implemented quickly. I get it. I've been there myself with ideas I've submitted that I've wanted to see in the core Canvas product. It sure would be nice for Instructure to be able to develop all of our ideas, but like many other companies, Instructure has a budget and a given set of resources to use. I'd encourage you to follow the Canvas Product Roadmap - Instructure Community (canvaslms.com) to learn more about what things Instructure has coming to Canvas in the near future and beyond.
I know this might not be the answer you're looking for, but I hope it helps to clarify how things work currently in Canvas. Take care, and be well.
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