I still believe - as I argued in the past - a four columns layout should be avoided if possible. Would I work on a mac with a 24" or 27" display I probably wouldn’t care. But on my 13" Mac book air four columns definitely don’t work. Maybe the ui trick used by ulysses app could be considered where the left bar and the notes list overlap the editor and closes automatically when a fourth column on the right is open. Here I posted a video more than one year ago:
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