Configure the Display Settings
When you connect an external monitor to a laptop, the default setting creates a mirror image of your laptop screen on the external monitor. In contrast, when you connect an external monitor to a desktop computer, the display defaults to extend these displays. You should be able to drag a window from one monitor to the other without changing any settings.
Method 1: Win + P Keyboard Shortcut.
Close all open programs.
Hold down the Windows logo key and press the P key on your keyboard.
Select "Duplicate" of the following options:
Duplicate: This setting will duplicate your laptop screen image on both monitors based on the monitor with the lower resolution.
Method 2: Screen Resolution Menu.
Close all open programs.
Right-click an empty area on your desktop, and then click Screen Resolution.
Click the Multiple Displays drop-down list, and then select Extend These Displays or Duplicate These Displays.
If you cannot see the additional monitor(s) listed, click Detect. If it does not work, try restarting your computer and repeat steps 1 and 2.
Duplicate these displays: This setting will duplicate your laptop screen image on both monitors based on the monitor with the lower resolution.
Click Identify Monitors to see which monitor is number 1 and which is number 2; then drag the monitor icons to reorder their positions to match the physical setup you have chosen.
Click the Resolution drop down menu, and select a screen resolution by moving the slider arrow right or left; then click OK.
If the new settings are compatible, your computer screen will reappear with the new settings in place. To change display resolution settings back to the previous setting, hold down the Windows Logo key and press the P key to change the mode to computer only.
Click Yes if you want to keep the new settings.
Restart your computer to ensure that the changes are saved.
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