xxxxxxxxxx
add_filter('woocommerce_enable_order_notes_field', '__return_false');
xxxxxxxxxx
/** Remove product data tabs */
add_filter( 'woocommerce_product_tabs', 'my_remove_product_tabs', 98 );
function my_remove_product_tabs( $tabs ) {
unset( $tabs['additional_information'] ); // To remove the additional information tab
return $tabs;
}