PDF Reader Pro allows you to use the Split View to divide the current interface into two, where you can simultaneously view and work with two different parts of the same file side by side, either vertically or horizontally. With the split view, you can scroll, compare the same multi-page document, change the magnification level, or turn to a different page in the active pane without affecting the other pane.
1. Enter reading page -> Page Display -> Split View in the top toolbar;
2. Under Split View, you can choose from the two options, Vertical and Horizontal, to view your PDF document. You can click Disable to exit the split view.