1. Go to the menu page by tapping on the more options icon.
2. Tap the "Text Reflow" icon under “Viewer” and you can view the PDF file displayed in text form.
3. At the bottom menu, you will see the options of Search/Auto Scroll/Next Page/Previous Page/Settings.
4. Tap Settings. You can adjust display tone, fonts, font size, speed of Auto Scroll, and activate “Auto Flip."