The icon will now change from crosshair to a camera. To capture an entire window on your Mac press the Command, Shift, the number 4 simultaneously and then press Space. If you want to cancel the screenshot, simply press the ESC key. When you have captured the screenshot release the button on your mouse. Now drag the crosshair across the portion of the screen you want to capture. This will make the crosshair icon appear. To capture a portion of the screen on your Mac press the Command, Shift and the number 4 simultaneously. If you use more than one display on your Mac, when you capture a screenshot of the entire screen it will automatically capture each display.
