The 5-way control button will jump you to the next (right) or previous (left) chapter, but only in books where navigation points have been coded into the MOBI file. A lot of MOBI/Kindle books don't have those navigation points coded in. You can see if navigation points have been coded by looking at the progress bar at the bottom of the screen - if it has small tick marks along it, those are the navigation points, and you'll be able to jump backwards and forwards using the 5-way control. If there are no tick marks, then that feature won't work.
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