I did think about this, but i don't think thats important. The easiest thing to do is to simply not show the note in the notelist, I don't think that's bad UX. While i was using standard notes that's how they did it and it was intuitive.
You could also put the opened note on the top of the notelist and isolate it with a spacer or divider to signal that it doesn't belong to that notebook.
Also a related setting could be for keyboard navigation behaviour: does going back to last/next note with a keyboard shortcut change to that note notebook (current behaviour) or the notebook doesn't change. I see both behaviors as being useful/logical so it's easiest to leave it like it is now.
Also another reason for this feature i forgot to mention is that you might have some more sensitive notes in Joplin. This way if you are showing somebody else your notes, you need to worry if switching to another notebook will open a note you don't want them to see.
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