code: public void showInNavigation(CmsUUID entryId) {
  
          CmsClientSitemapEntry entry = getEntryById(entryId);
          CmsSitemapChange change = getChangeForEdit(
              entry,
              Collections.singletonList(
                  new CmsPropertyModification(
                      entryId.toString()
                          + "/"
                          + CmsClientProperty.PROPERTY_NAVINFO
                          + "/"
                          + CmsClientProperty.PATH_STRUCTURE_VALUE,
                      "")));
          commitChange(change, null);
      }
docs: Shows a formerly hidden entry in the navigation.<p>
  
  @see #hideInNavigation(CmsUUID)
  
  @param entryId the entry id