You should see an indicator with a percentage. This will tell you about where you are in your book, and give you an idea how much is left till the end. If you see little dots, you can use your right button on the 5-way controller and navigate forward or back through the book a section (sometimes a chapter, sometimes not) at a time. The little arrow just above your progress bar indicates where you began that particular session.
If you are looking at a list of your books on your home screen, you should see a line of little dots below each one with bold dots indicating what you have read already.
It helps to know how far you have left to go and where you have been.
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