Thanks, that worked much better, however, it worked not perfectly though.
“Home” now stays there and nothing drops down but it still changes its class and its style.
Happily, I finally found the code that changes the class at 600px!
It’s in the “toggle.js”.
It even says in the code: “Toggle the the main navigation menu for small screens.”
It’s so obvious (actually… ?? )
Now, without these lines, it works perfectly.
Nevertheless thank you @keyaspects ??