Hello,

Unfortunately, it is not possible to configure cart as a sidebar on desktop and link on mobile. You can remove cart on mobile and add an icon with the link or button. Here are more instructions:
https://xtemos.com/docs/woodmart/header-builder/add-edit-builder-elements/ and https://xtemos.com/docs/woodmart/html-blocks-2/#header_builder

Please try this code:

body .woocommerce-breadcrumb .breadcrumb-last{
display:none;
}
body .breadcrumb-link-last:after{
display:none;
}

Add this code to the Theme Settings > Custom CSS > Mobile

Best Regards