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Open the window or menu that you want to capture.
Press and hold these keys together: Shift, Command, 4, and Space bar. The pointer changes to a camera icon . To cancel taking the screenshot, press the Esc (Escape) key.
Click the window or menu to capture it. To exclude the window’s shadow from the screenshot, press and hold the Option key while you click.
If you see a thumbnail in the corner of your screen, click it to edit the screenshot. Or wait for the screenshot to save to your desktop.