title: MATE menu is not configurable
body: <p>I am using linux mint.<br>
  This is my Menu.<br>
  <a href="https://imgur.com/lFDWofN" rel="nofollow noreferrer"><img src="https://i.imgur.com/lFDWofNs.png" title="Hosted by imgur.com"/></a><br>
  I am able to edit the menu under "Application". But I am not able to edit the menu under "Places" and "System". I would like to remove the "Package manager" and "Control panel" menu items under "System".</p>
  
  <p>Is there a way to edit that menu? </p>