Dear,
After upgrading the template I saw that some menu items were not shown.
After debugging / comparing I finaly found the problem.
In the file /plugins/system/helixultimate/src/Core/Classes/HelisultimateMenu.php in line 364 a check was introduced.
In my situation the menu items which were not shown did not have a parameter menu_show so the check caused the problem of not showing the menu item.
After saving tjhe menu item (without changing) the menu item was shown again.
I think I will not be the only one who encounters this problem
Regards Ernst