Connect an extra monitor
To set up a second monitor with your desktop computer, connect the monitor. If your system doesn't recognize it immediately, or you would like to adjust the settings:
Click your name on the menu bar and select System Settings.
Open Displays.
Click on the image of the monitor you would like to activate or deactivate, then switch it ON/OFF.
The monitor with the menu bar is the main monitor. To change which monitor is "main", click on the top bar and drag it over to the monitor you want to set as the "main" monitor.
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To change the "position" of a monitor, click on it and drag it to the desired position.
If you would like both monitors to display the same content, check the Mirror displays box.
When you are happy with your settings, click Apply and then click Keep This Configuration.
To close the Displays click on the x in the top corner.