Tap the A icon in the upper right-hand corner to customize your ebook's appearance, and use the slider to select your preferred text scale. With the option to include accessibility sizes.

Next, tap to choose a lighting scheme including options for bright sepia, dark, and high contrast modes.

You can also select a book design to change. The textile reading settings are sticky for the device you're using. When you open another ebook on this device, your reading settings will automatically be applied.