I created this script with
Autohotkey to easily switch between single video monitor, extended video monitor and even to turn off all monitors.
;------------------ Ctrl+0: TURN OFF ALL VIDEO MONITORS
^0::
Sleep, 500
SendMessage,0x112,0xF170,2,,Program Manager
return
;------------------ Ctrl+1: SET A SINGLE VIDEO MONITOR
^1:: Run displayswitch.exe /internal
;------------------ Ctrl+2: SET EXTENDED VIDEO MONITORS
^2:: Run displayswitch.exe /extend