ViewSonic VA1930WM LCD Monitor "widen screen view computer" Questions

Widen view to go across two screens - cannot now return to single Using the monitor controls (1 & 2) widened the view to go across my two screen. Now I cannot find how to get it back to single ...

...view of the screen. The desktop and all programs were then of course displayed "sideways" on the screen. Was unable to find any graphic card adjustments (for my existing card) or Chimei software or ...