code: def toggle_show_cd_only(self, checked):
          
          self.parent_widget.sig_option_changed.emit('show_cd_only', checked)
          self.show_cd_only = checked
          if checked:
              if self.__last_folder is not None:
                  self.set_current_folder(self.__last_folder)
          elif self.__original_root_index is not None:
              self.setRootIndex(self.__original_root_index)
docs: Toggle show current directory only mode