title: How to stop angular mat-menu from closing when you click outside of it?
body: <p>I'm using MatMenu as a popup to tour around new users on my web app so I don't want to dismiss it whenever the user clicks outside of it.</p>
  
  <p>I've already used used $event.stopPropagation() to stop it from closing when I click a button inside it. Now I want to know how to keep it open even if you click outside of it.</p>