ViewSonic VA1930WM LCD Monitor "disable extended view" Questions

...extended view try using clone mode then both laptop screen and external monitor will show the main screen other method is to disable the laptop screen and just allow external monitor to work, in this ...

...disable it ...this will default the view also to a single display for laptops the short cut for this on keyboard is FN+F4.. but if it is a desktop ..Im not sure if it will work or not...anyway ..just ...