Hello @holmesm1 ...
I believe there is a way to it disable the Canvas "Inbox", but it *may* disable it for all instructors at your school...not just you. So, this would be a larger decision that would have to be made at your school whether or not everyone would want to use it or not. You may have colleagues that like to use the Canvas "Inbox" and would not want it to go away. I believe your Canvas administrator(s) would have to talk with their assigned Customer Success Manager team at Instructure about this.
Not sure if this is completely helpful, but hopefully you will be able to have some additional conversations with folks at your school.
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