With the steps below you can turn off a screen, or change the settings of the image:

1. Press the Windows button + the letter P on your keyboard (Windows Start + P).

2. Now you will see four options; choose one of the following:

   1. PC screen only: show only the main screen.

   2. Duplicate: show the same on all screens.

   3. Extend: Show unique images on all screens.

   4. Second screen only: show only the second screen.

Don't forget to change the setting back to 'Extend' when you're done!