i think that the app is still pre-opimised for a 5 inch phone ( the original target market), so by default it sets headings sizes, positions to better suit a small screen.
one nice semi-hidden setting is that you can backup all the app preferences once its as you like it , to either dropbox or google drive. the device name and the date is included in the file name.
also, you can have bookmarks, and latest page saved to dropbox for books that you are reading. That syncs across devices.
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