To change your display settings to either extend or duplicate, please follow the basic steps below.
In Windows press the Windows Key + P and the display preferences will appear on the right hand side of the screen.
Select the option that you wish to use.
If you choose extended and moving your mouse between screens doesn't happen in the correct order, you may need to re-arrange the order of your screens.
This can be done by going to your start menu and typing "Display" and selecting "Display Settings" from the list:
In the settings window you will see numbered boxes for each of your screens, you can move these to the correct location and then apply the changes to ensure your mouse moves properly between screens.