How to unfavourite a deleted Smart Mailbox in macOS Mail?
I accidentally deleted a Smart Mailbox in macOS Mail that was one of my Favourites. Now the mailbox is gone, but the item still shows up in my Favourites list in the sidebar. I can't click on it in the Favourites list, nor select it from the menu or with the Cmd-# keyboard shortcuts. How can I get rid of it? Is there some .plist file I could blow away that wouldn't also trash a bunch of other preferences?
MacBook Pro (M1, 2020)