Changing your display settings on your Laptop/Desktop ranges from changing the resolution to changing your main monitor. 

1) To change your monitor orientation you need to right-click your desktop background and select ''Display Settings''.

2) This should take you to this page... ( Your page may look different depending on the number of monitors).

3) From this page, you simply drag and drop the boxes to re-arrange your monitors. You can also click Identify to show which monitor represents which number. 


4) If you want to change your main monitor, (E.G. making an external monitor your main display) all you need to do is select the box you want your main monitor to be, and scroll down and select ''Make this my main display''.

From this menu, you can also change the brightness of your monitor and change the resolution by selecting it and scrolling down and selecting resolution or brightness whichever you may need.