On a Fire tablet, open a book and tap the page, then tap Font (Aa) > Layout > Black. This article explains how to use Dark Mode on Kindle. The information applies to certain Kindle models made in 2017 ...
To find screen warmth from the library screen, tap the three dots (top right), then choose Settings > Screen and brightness > Brightness and warmth. You can even activate the Warmth schedule option, ...
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