Resolution:  

1. Right click the windows Icon in the lower left side of your screen, then click on "Settings"
    
2. Click on "System"
    
3. There should be some boxes on your screen with numbers in them, click "Identify" to see which number corresponds with each number
    
4. Move and arrange the boxes so they look like how your monitors look on your desk.

If you need to change which monitor is your 'Primary" monitor, click the box with the corresponding number for the monitor you want to set as the primary, then scroll down to the bottom and check the box that says "Make this my main display"