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 the display tone, fonts, font size, and speed of Auto Scroll, or activate “Auto Flip."