Display Mirroring on MacOS enables users to project a direct image of the computer screen. Once connected to a projector, external monitor, or HDTV (either through HDMI or VGA) follow the instructions given below.
Click the Apple logo in the top left corner of the home screen. A context menu will appear.
Once the menu is opened click System Preferences. The System Preferences menu will open.
Click on the Displays icon. It will open a the Built-in Display menu.
Click Arrangement on the top center of the window.
Check the Mirror Displays box on the bottom left corner of the same window.
Click the red X to close the Display Preferences menu window.