I have tried both examples. Unfortunately without consequence. The menu now gives the correct issue, so without a 'noopener' but does not switch to the desired page.
Below is a part of the menu as now in the issue of WB.
<?php show_menu2(0,SM2_ROOT,SM2_ALL,SM2_ALL,'[li] <a href="[url]" class="[class]"><span>[menu_title]</span></a>','</li>','[ul]','</ul>',false,'<ul id="nav">');?>
<a href="http://localhost:4001/wbdemo" class="menu-first"><span>Home</span></a>
I dropped the old call with <!--- and -->, but I saw in the source code that it was executed and indicated in green. I can not assume that this rule still affects the implementation of the menu?
<!-- <ul id="nav"><li class="menu-first"><a href="http://localhost:4001/wbdemo" target="_top" rel="noopener" title="HOME">Home</a></li> etc. </ul> -->