Search closed notebooks
"Search all notebooks" is extremely misleading, as the search only pulls up results in OPEN notebooks.
There should be an option to "search all open notebooks" and "search all notebooks (including closed ones)".
I'm genuinely nonplussed that users haven't gone up in arms about this. Why would you want to create a note and then never be able to find it again? What's the point of the note? Perhaps people just never close their notebooks. Unfortunately, when I migrated from Evernote to OneNote, all my notebooks were closed.
I wouldn't want this feature, so would want it to be optional if implemented. Some computers that I use publicly I only open certain notebooks on - if everything I have ever made on that account showed up in my searches, I'd need to encrypt every single section, since you can't just password protect a whole notebook. I had the same problem with the notification bell showing changes in all of my notebooks, although I can see the benefit of these.