Yes, it is desirable to create 1 for each language.

In our theme-packs there's only one menu item for easy set-up.

The system is smart enough to detect which menu item should be used, just remember to set the menu item language.

Kind Regards

ok
So I should create in the English main menu a Engine menu, language only english, linked to "Search Module - En", language only English, assigned to ? what option should I use ?

Hello there,

We recommend that you create 2 menus items in the "System" menu, setting different language on each one.

You don't need to create 2 search modules, as the new version has an "intelligent" router that will automatically detect the correct menu item to point the search.

Hope this helps