To set up an additional monitor, connect the monitor to your computer. If your system does not recognize it immediately, or you would like to adjust the settings:
Open the Activities overview and start typing Settings.
Click on Settings.
Click Devices in the sidebar.
Click Displays in the sidebar to open the panel.
In the Display Arrangement diagram, drag your displays to the relative positions you want.
Click Primary Display to choose your primary display.
The primary display is the one with the Activities overview is shown., and where the
Select the resolution or scale, and choose the orientation.
Click Apply. The new settings will be applied for 20 seconds before reverting back. That way, if you cannot see anything with the new settings, your old settings will be automatically restored. If you are happy with the new settings, click Keep Changes.
With two screens, these display modes are available:
Join Displays: screen edges are joined so things can pass from one display to another.
Mirror: the same content is shown on two displays, with the same resolution and orientation for both.
Single Display: only one display is configured, effectively turning off the other one. For instance, an external monitor connected to a docked laptop with the lid closed would be the single configured display.
With more than two screens, Join Displays is the only mode available.
Use the drop-down menu to choose which screen to configure.
Drag the screens to the desired relative positions.
Each screen can be turned off or on using the ON | OFF switch.
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