Amazon Kindle User Manual page 67

In landscape orientation, Kindle automatically magnifies your document to fit the
width of the screen to improve readability.
A black outline defines the limit of the page of the PDF document. In both portrait and
landscape orientations, the bottom of the screen shows how far you have read in a
particular item as a percentage, and displays the current page number, as well as the
total number of pages of the current document.
KINDLE USER'S GUIDE 4 EDITION
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Chapter 3 · 67