Why the icon cart is visible only in the desktop version of the website?

Why the icon cart is visible only in the desktop version of this website https://eurocorsi.it/ instead for mobile and tablet it is hidden? How to adjust it?

 

Ok divi support already answered to me:

By default, the cart icon appears on small screens only if the Slide-In Header layout is used in the Header Format settings. To display the cart icon on mobile and tablet devices, you have two options:

1. Using a Child Theme:
   • Install and activate a Divi child theme
   • Copy the header.php file from the Divi folder to your child theme folder
   • Edit the header.php file in your child theme
   • Add the line: <?php et_show_cart_total(); ?> after the #et-top-navigation div
   • Add custom CSS to Divi → Theme Options → General Tab → Custom CSS
2. Using Theme Builder:
   • Go to Divi → Theme Builder
   • Create or edit the Global Header layout
   • Use the Menu module
   • Enable "Show Shopping Cart Icon" in the Menu module settings

Choose the method that best suits your needs and website setup.
Source: https://help.elegantthemes.com/en/a...display-the-cart-icon-on-small-screen-devices