code: def _fallback_to_available_output(self):
          
          if len(self.active_comb) == 1:
              self._choose_what_to_display(force_refresh=True)
              self._apply()
              self.py3.update()
docs: Fallback to the first available output when the active layout
          was composed of only one output.
  
          This allows us to avoid cases where you get stuck with a black sreen
          on your laptop by switching back to the integrated screen
          automatically !