This has bitten both myself and my wife in the ass twice now. (in both cases, because -- at the time -- each of us didn't know how to undo it). Say I've created a shopping list. It's just a note with a bunch of items in it. At some point into it I realize, "this is long, I should turn this into a checklist list". On the desktop app: Select all the rowsHit the "checkbox list" buttonThe rows all become rows with checkboxes. Life is good.On the iOS app, though... Select all the rowsHit the "checkbox list" buttonWatch your grocery list vanish and be replaced with a "new" empty checkbox list.