Integration between Calibre and iOS can best be described as problematic these days. My personal recommendation would be to use Calibre Companion (which has its own forum here on MR) for library management, and whatever you fancy as a reading app to actually read books. I like MapleRead as a reading app, personally.
I'm curious at your mention of iOS 11.3. Is this a beta release? The current version of iOS is 11.2.5, to the best of my knowledge!
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