Displaying pages across 2 screens
Firstly, you will probably want to select the ‘Facing’ option from the View > Page Layout menu in the Viewer so that two pages are showing side-by-side in the Viewer. That way you can have different pages displaying on each screen once you follow the instructions below.
Un-maximize the Viewer window, left-click with the mouse on the Viewer window border and drag the Viewer window across the two screens. You can then resize both the Viewer Window and document zoom size so that different pages are displayed at the same time on each screen.