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Method #1:

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1. Right click on your mouse or track pad and select "Display Settings"
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2. You will then be prompted with your display settings, scroll down to "Multiple Displays" and select "Duplicate these displays"
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3. A message will prompt, then select "Keep changes"
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4. Your displays are now duplicate.

Method #2: Extend your displays 

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Switching Between Displays (Keyboard)

1. By pressing the "Windows Key" and "P" on the keyboard you can switch between Duplicate and Extended displays.
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2. On the right of the screen you will be prompted with options to switch your displays. You may use your mouse to select the display you want. 
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 Method #2: Duplicate your Displays

1. Right click on your mouse or track pad and select "Display Settings"
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2. You will then be prompted with your display settings, scroll down to "Multiple Displays" and select "Extend Duplicate these displays"
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3. A message will prompt, then select "Keep changes"
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4. Your displays are now duplicate.

Method

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#2: Extend your displays