WooCommerce 3.3 - Hide uncategorized category from the shop page on the frontend and Remove Categories from WooCommerce Product Category Widget

hide-uncategorized-category.php

<?php
/**
 * WooCommerce 3.3 - Hide uncategorized category from the shop page on the frontend and Remove Categories from WooCommerce Product Category Widget
 */
add_filter( 'woocommerce_product_subcategories_args', 'krs_remove_uncategorized_category' );
add_filter( 'woocommerce_product_categories_widget_args', 'krs_remove_uncategorized_category' );
add_filter( 'woocommerce_product_categories_widget_dropdown_args', 'krs_remove_uncategorized_category' );
add_filter( 'ywcca_wc_product_categories_widget_args', 'krs_remove_uncategorized_category' );

function krs_remove_uncategorized_category( $args ) {
  $args['exclude'] = get_option( 'default_product_cat' );
  return $args;
}