Snippet to set default ordering for specific WooCommerce product category

category-default-ordering.php

<?php

// orderby values are date, menu_order, popularity, rating, date, price, price-desc

add_filter( 'woocommerce_default_catalog_orderby', 'custom_default_catalog_orderby' ); 
function custom_default_catalog_orderby() {
	if ( is_product_category( array( 'category-1-slug', 'category-2-slug' ) ) ) { // Replace with your category slugs
		return 'menu_order';
	} else {
		return 'date'; 
	}
}

?>