PDF Reader Pro allows you to read in Dark Mode. Instead of changing the background color of the documents, dark mode affects only the colors of the menu and buttons, which helps you stay focused on your content. With toggling between Dark Mode and Light Mode, you can enjoy working with PDFs in light or dim environments.
1. Tap Settings 
on the Home page. 2. Scroll down to the button Dark Mode, click it to turn the Dark Mode On and Off.
