How to Display Laptop Screen via Projector
Mac:
Go to System Preferences (click on the Apple logo on the very top-left of the screen
and choose System Preferences)Choose the “Displays” option.
Select the “Arrangements” tab.
Make sure the “Mirror Displays” option is enabled.
Windows:
Minimize all windows so that you are looking at your desktop background.
Right-click on any empty space.
Select “Display Settings”.
Under the Displays Dropdown menu, set it to “Duplicate these displays”.