Dear Zed, I finally created a simple and tiny CSS script for my childtheme’s style.css setting the whole sub-menu only a bit to the left:
.sub-menu {
left: -40px;
}
This way I keep some longer menu entries ‘within the screen’ of smaller computers resolution, just before the menu would toggle to ‘tablet menu view’ with the ‘list menu’ appearance. No JavaScript needed and no ‘destruction’ of the theme, I think.
Again thank you very much for this fantastic theme and your fast and serious support!