
MacBook Air laptops running macOS Mojave or later come with a preinstalled app called Screenshot.
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How to Make a Screen Recording and More on MacBook Air As with the other MacBook Air screenshot methods, a screenshot of an individual app or window will also save to your desktop and display a temporary clickable preview after it’s created. The cursor will turn into a small camera icon. If you just want to take a screenshot of a open window or app instead of the entire screen, press command + shift + 4 + spacebar at the same time and then click on the window you want to screenshot.
How to Screenshot an App Window on a MacBook Air

To take a screenshot of just a specific part of your desktop or an app on your MacBook Air, press command + shift + 4. The pointer will then into a crosshair for you to click and drag so you can select the part of the screen you want to capture. How to Screenshot Part of Your MacBook Air’s Screen
