ludo974
Hi
You can try the standard Menu to get similar view : yoursite url/index.php/accueil/home-navbar-standard
If you want to customize the header code, it can also possible via T4 template layout builder > Edit layout > edit the header main nav code.
Here is documentation to customize the header : https://www.joomlart.com/documentation/joomla-templates/ja-spa#menu-style