I have it set to show 100 active convos. It is now showing 25 sometimes, and 50 at others, and insists I have several threads hidden and offers to manage them for me. Despite clicking it wont go away, and no matter how I reset my threads to show in active it still does it very much as it pleases.
I am using Edge on a PC. And driven demented by the noisy ad but that's another thread.