To change the display on which your Windows taskbar, system logon, & dialog boxes appear
Make sure you have securely connected the additional displays you want to use to your computer.
Verify that your displays are plugged in and turned on.
From the NVIDIA Control Panel navigation tree pane, under Display, click Set up multiple displays to open the page.
Right-click the display icon that corresponds to the display that you want to make the main (primary) display, click Make Primary and then click Apply.
To identify which display is represented by an icon, right-click the icon and then click Identify to see which display shows the same number as the icon. You can also move the mouse cursor over an icon to see more information about the display, such as manufacturer, model, connection, and resolution.
Note: On netbooks using NVIDIA® Optimus™ technology with display connectors driven by the NVIDIA GPU, games and videos on those displays will perform best when the display is set as the main (primary) display. You will not get the best performance by simply dragging the program window over to the NVIDIA GPU-driven display.