 <p>From the <a href="https://skvare.com/blog/non-existent-urls-views-2" rel="nofollow">source</a>:</p> <p>The solution is to edit the view by adding an Argument of Node: Nid. Set it to Display all values, Validator: Node, and Argument type of Node ID. </p> <p>Set Action to take if argument does not validate: Hide view / Page not found (404). Update the Argument and save the view.</p>