If your monitors are mirroring the same display as the original monitor this means your computer is in “Mirror” desktop mode. You can change this to Extended display mode which adds the second monitor as extra screen space. See below for information to change the setting to extended display mode:
• Right-click on the Desktop wallpaper and Select Display Settings
• Under the Display category click on monitor 2
• Look for the Multiple Displays option, pull down on the menu and select Extend desktop to this display. If the problem is not resolved. Follow these steps:
• Hold the ⊞(Windows key) + X. Select Device Manager.
• In this list, double click on Display Adapters, right-click the listed video card and select Uninstall Device. Tick the box that says Delete Drivers for this Device. Wait for it to finish.
• Right-click any item in the list and select Scan for hardware changes.
• Under Display Adapters, you will find a newly installed adapter. Right-click it and select Update Drivers, Search Automatically.
• Your desktop should now be extended to the second monitor.