Hello,
You’ll lose changes you make in the parent theme after theme update. If you need to change any functions from the parent theme use child theme.
So, you need to copy
xstore/woocommerce/cart/cart-empty.php to xstore-child/woocommerce/cart/cart-empty.php,
xstore/woocommerce/cart/cart.php to xstore-child/woocommerce/cart/cart.php,
xstore/woocommerce/loop/no-products-found.php to xstore-child/woocommerce/loop/no-products-found.php and replace Return To Shop with link you need https://developer.wordpress.org/reference/functions/home_url/ .
Regards