What Mkane is referring to is a set of tabs welded onto the fork dropouts that is supposed to stop a wheel from falling out of the dropout if you forget to clamp down on the quick release handle. Also known as “lawyer lips”, there’s a history about them. You need to loosen the QR enough to get the wheel past the lips when removing the wheel. When putting the wheel back in the dropouts you need to screw down the QR so that when you tighten the handle, it will secure the wheel. Usually you position the handle at about 90 deg. to the fork, then tighten the nut, then press the QR handle tight.