code: private void initUpperLeftComponent() {
  
          m_upperLeftComponent = new HorizontalLayout();
          m_upperLeftComponent.setHeight("100%");
          m_upperLeftComponent.setSpacing(true);
          m_upperLeftComponent.setDefaultComponentAlignment(Alignment.MIDDLE_RIGHT);
          m_upperLeftComponent.addComponent(m_languageSwitch);
          m_upperLeftComponent.addComponent(m_filePathLabel);
  
      }
docs: Initializes the upper left component. Does not show the mode switch.