Do you mean the search bar, the menu or the purple blurb? The main menu is created with a plugin Divi Mad Menu. The search bar seems funny in your image, but it doesn’t look like that in any of my browsers, I will have to look at that. The search bar is made with FiboSearch plugin. The purple blurb is customized from a separate template from Divi Shop Builder only on cart and oayment pages.
Are any of these plugins conflicting with the heart icon on product loop and single product pages?