title: How to change backoffice ui in ext-backoffice-config.xml file
body: <p>I am new in Hybris, sorry if it is silly question. 
  I have existing project and I am trying to figure out how to change  backoffice ui.  I need to change 'backoffice > Order > Orders'. I tried modifying cus_ext-backoffice-config.xml file. But it did not change anything. </p>
  
  <ol>
  <li>Can someone please tell me if I am modifying right file. </li>
  <li>Is there any way I can interact backoffice through hmc.</li>
  </ol>