Dual view allows you to customize your Home screen panels by displaying your Home screen panels (on top) and the Apps screen (on the bottom) at the same time.
Touch and hold an empty spot on a Home screen panel.
OR
From the Home screen, tap the Menu key , then tap Add apps & widgets.
In dual view, the current Home screen is displayed above selection choices. Three tabs are displayed along the bottom. Tap App, Widgets, or Wallpaper.