Change the primary monitor

To change the primary monitor

Open Display in Control Panel.
On the Settings tab, click the monitor icon that represents the monitor you want to designate as the primary one.
Select the Use this device as the primary monitor check box.
This check box is unavailable when you select the monitor icon that is currently set as your primary monitor.

note Note

To open a Control Panel item, click Start, point to Settings, click Control Panel, and then double-click the appropriate icon.
The monitor that is designated as the primary monitor will display the logon dialog box when you start your computer. In addition, most programs will display windows on the primary monitor when you initially open them.