I need to make a monitor my main display on a Windows PC

1. Right click a blank spot on the desktop of the laptop. Choose Display Settings from the list.

3. You will see this screen.

Click Identify to see which monitor comes up with a 1 and which with a 2. You can use the mouse to drag the monitors into the arrangement that they are on your desk. You can duplicate or extend the displays using the setting below the two monitor images. Click on the monitor you want to be the main display and click the box to set it.