If you're more of a watcher with a bigger screen, then you may learn how to screenshot on Netflix with Windows or Mac here. Though you'll get a black screen when taking screenshots of a Netflix video directly, you'll succeed after making a few tweaks. Pick a preferred way below and let's make the way out.
Netflix may also utilize your graphics card to detect your streaming and apply DRM protection to the video you're watching right now. That's why you'll result in a black screenshot with nothing. Thus, it's worth trying to disable your display adapter and then take a screenshot on Netflix later. You may want to grasp the idea here.