Add a radio button to options, or modify Archive, to protect an outline from being inadvertently deleted. This happened to me when I was trying to deconflict a file on my iPad with one on my iPhone. I inadvertently swiped a similarly named outline and the sync process deleted it instantly on both devices with no way for me to undo that deletion. I lost an outline representing the entirety of my work in the month of June! With a protect mode, it would at least give me a question for verification.