I would have one last thing to ask: you can do so by selecting the "Prestazioni" in the top-menu, the page moves to the relevant section on the homepage?
You can change "Menu Item Type" to "External URL" with link is "#jf-latest"
I would also like to know how I can change the text displayed on the "Contacts" in particular I would like to change the language
You can find and change in templates/jf_calla-exteriors/html/com_contact/contact/default.php file.
joomfreak