Why is my second monitor a copy of my main monitor?

- On your computer go to the desktop and right click, go to Display options. 

- Scroll down to the 'Multiple Displays' section. On the drop down menu change it to 'Extend these displays'. The monitor should show up as a separate screen after that. 

- If it's not positioned correctly then scroll to the top of that page, it has a visual diagram where you can move the monitors around in relation to one another.