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I am trying to customize the html in theme/woocommerce/layout-products/grid.php, I have copied the file from parent theme to theme-child/woocommerce/layout-products/grid.php but without any effects. From the answers I found here I understand that sometimes copying the php file works, sometimes not? I also tried the require_once for this file but this breaks the whole WordPress. How can I customize the product grid html?