Then, click and drag it over the area of the screen that you want to crop. Just press Command + Shift + 4 to bring up the snipping cursor.
You can also take a screenshot by cropping out a specific area of the screen. By default, the cropped screenshot will appear on your desktop. Finally, select Done to apply and save your changes. On the Quick Look window that shows up, select the Crop icon, and start cropping as usual.