Configuring Dual Monitors
- Select Start, and then open Settings.
- Under System, select Display. Your PC should automatically detect your monitors and show your desktop. If you don't see the monitors, select Multiple displays, and then Detect.
- Use the dropdown list next to the image of your desktop to choose how your screen will project across your displays.
- Once you've chosen your setup, and select Apply.
https://support.microsoft.com/en-us/windows/set-up-dual-monitors-on-windows-3d5c15dc-cc63-d850-aeb6-b41778147554