How to hide NAV Radio display in G3X touch

As in my aircraft there is a NAV equipment I have entered this line in the panel.xml

  <Radios com-count="0" nav-count="1" marker-beacon="true">
  	<Nav index="1" />
  </Radios>

But I would like to have no NAV control shown in the G3X top bar but currently there is only the option to select the location between PFD, MFD or BOTH instead I would like to have also NONE