code: public void setLargeIcons(boolean largeIcons) {
          this.largeIcons = largeIcons;
          if (getCompositionRoot() != null) {
              if (largeIcons) {
                  getCompositionRoot().addStyleName(ValoTheme.MENU_PART_LARGE_ICONS);
              } else {
                  getCompositionRoot().removeStyleName(ValoTheme.MENU_PART_LARGE_ICONS);
              }
          }
      }
docs: Specifies whether the side bar should use large icons or not.
  
  @see ValoTheme#MENU_PART_LARGE_ICONS