I have a laptop and a LCD screen. I want to keep the laptop screen off while work with the LCD screen unless I want to turn the laptop screen off. How can I achieve this?
In Windows 7, choose the Projector Only option.
In Windows 8 and Windows 10, choose the Second screen only option.
Go to Control Panel and then choose System and Security.
Choose Power Options and then select
Choose What Closing the Lid Does from the left pane.
When I close the lid option select "Do Nothing" for both "On Battery" and for "Plugged in".
Click Save changes
That is it, now you can close the laptop screen and keep working on your LCD.