Extend these displays mode shows the Windows desktop extended across all displays. This configuration is most commonly used to get more workspace. You can take advantage of the extra workspace to view different applications on different displays.
Figure : Extend these displays
To help identify your monitors, click Identify Monitors. The numbers 1 or 2 are shown on the monitor icons to help you identify them.
(Optional) To adjust the resolution, in the Display Settings window, select a monitor and slide the resolution slide bar. Click OK to save the setting and exit.
(Optional) To change the direction the desktop will extend (left or right to match how the displays are physically set up), select a monitor and drag it to the desired position.