Edit File: header-cart.min.js
document.body.classList.contains("woocommerce-cart")||document.body.classList.contains("woocommerce-checkout")||window.innerWidth<768||!document.getElementById("site-header-cart")||window.addEventListener("load",function(){document.querySelector(".site-header-cart").addEventListener("mouseover",function(){var e=window.outerHeight,t=this.querySelector(".widget_shopping_cart_content").getBoundingClientRect().bottom+this.offsetHeight,o=this.querySelector(".cart_list");e<t&&(o.style.maxHeight="15em",o.style.overflowY="auto")})});