DISPLAYSWITCH.exe

Specify which display to use and how to use it.

Syntax
      DISPLAYSWITCH /Option

Options

       /internal    Switch to use the primary display only.
       1            All other connected displays will be disabled. 

       /clone       The primary display will be mirrored on a second screen.
       2        

       /extend      Expand the Desktop to a secondary display.
       3            This allows one desktop to span multiple displays. (Default).

       /external    Switch to the external display only (second screen).
       4            The current main display will be disabled.

Running DisplaySwitch.exe without any options will open a GUI.
The command is located at: "%SystemRoot%\System32\DisplaySwitch.exe"

Examples

Mirror the current Desktop on a secondary display:

C:\> DisplaySwitch /clone

Extend the Desktop to a secondary display:

C:\> DisplaySwitch 3

"The mission of the press is to spread culture while destroying the attention span” ~ Karl Kraus

Related commands

MODE - Configure a system device COM/LPT/CON.
DisplayConfig - PowerShell module to manage display settings: Resolution, scaling, desktop positions etc.