Nav to different chapter in same book
It takes too long to navigate more than a few chapters in the same book by swiping (during a sermon or for reference). I suggest separating Book from Chapter/Verse in the header bar. Put them sise-by-side instead of above/below. Tapping the Book will go all the way back to book selection (level 1). Tapping on the Chapter/Verse will go back to level 2 to choose chapter (then verse) within the current book.
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I implemented this a few years ago but did not release it. I think the difficulty was the lack of space in action bars on small phones. I might take another look at this in the future.