title: Full screen switch in ProcessFlow control SAPUI5
body: <p>The <a href="https://experience.sap.com/fiori-design-web/process-flow/#components" rel="nofollow noreferrer">UX guidelines</a> for <code>sap.suite.ui.commons.ProcessFlow</code> mentions of a header toolbar, with the possibility of a 'Full screen' toggle for the entire ProcessFlow control, apart from 'Zoom In', 'Zoom Out' etc. (see top right in the image).
  However, the API doesn't have any aggregations to add neither the toggle nor any toolbar. </p>
  
  <p>Is it possible to add a Full screen toggle to ProcessFlow control?</p>
  
  <p><a href="https://i.stack.imgur.com/GVXzJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GVXzJ.png" alt="enter image description here"></a></p>