I may have misunderstood your question. The back button does take you to the picture of the book & the read button. If, while reading a book, you want to change the font settings, you tap various places on the screen ( it doesn't seem all that consistent) until the bottom bar changes from a page-number and percent-read display to one with a few other symbols on it. Those will get you to font settings. It might give you more general settings or you might need to hit back-button to the book-image, then again to the app main screen. I don't have a book currently checked out, so I can't easily check and am going by memory. I certainly agree that as an ereader app it leaves a lot to be desired.
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