change-limit-for-dynamic-variable-product-dropdowns.php

/**
 * Change Limit on Number of Variations for Dynamic Variable Product Dropdowns
 *
 * @param  mixed $qty Quantity of Product
 * @param  mixed $product Get a woocommerce product.
 */
function wb_wc_ajax_variation_threshold( $qty, $product ) {
	return 10;
}

add_filter( 'woocommerce_ajax_variation_threshold', 'wb_wc_ajax_variation_threshold', 10, 2 );