code: protected boolean isStartViewAvailableOnRoot() {
  
          if (!m_startview.isEnabled()) {
              return false;
          }
  
          return !m_startview.getValue().equals(CmsPageEditorConfiguration.APP_ID)
              & !m_startview.getValue().equals(CmsSitemapEditorConfiguration.APP_ID);
      }
docs: Checks if the currently chosen start view is visible for root site.<p>
  
  @return true if app is available for root site