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, ...

While you don't need to worry about file formats with Kindle books purchased from Amazon, you might have books from other ...

Calibre has a lot of built-in features, but there are some things that I had to resort to plugins to get right.