How do you get rid of a no external display is attached pop up on my computer?

To resolve the "no external display is attached" pop-up on your computer, first check the physical connections between your computer and the display to ensure they are secure. Then, right-click on the desktop, select "Display settings," and scroll down to the "Multiple displays" section to choose "Disconnect this display" if it appears. Additionally, updating your graphics drivers or disabling any unused display outputs in your graphics settings may help eliminate the pop-up. If the issue persists, consider restarting your computer.