Sometimes you will need to change your settings between Extend, Duplicate or even Second screen only and PC screen only when having any additional monitors (or projectors) connected to your computer.

It is easy to change between the different modes, all you need to do is press and hold the Windows flag key and the letter P on your keyboard to bring up the following menu.

Select the desired option using your mouse or the up down arrows until the desired setting is highlighted blue and then press enter.