Step 1: All your objects should be in view in the editor view. Again, there are two ways to reach the Display Filter feature: the menu Selection=>Display Filter or the view panel with a question mark button on the toolbar next to the Selection Filter. Click on the Display Filter button.
Step 2: As soon as you click the button, there's a list that looks almost exactly like the Selection Filter list. When you uncheck something from the list (for example, Null), everything under that category disappears from view.
Step 3: To bring the vanished objects back into view, go back to the Display Filter button and recheck the objects you want viewed again.