WooCommerce 3.3 - Hide uncategorized category from the shop page on the frontend

functions.php

<?php // Do not include this if already open!

/**
 * Code goes in theme functions.php.
 */
add_filter( 'woocommerce_product_subcategories_args', 'custom_woocommerce_product_subcategories_args' );

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

"Hide uncategorized category from the shop page on the frontend" - this is more like "Hide default category from the shop page on the frontend", so it's kind of not doing its thing, and can be quite harmful if you use other category as your default category. Remove this file please.

For sidebar try:

add_filter( 'woocommerce_product_categories_widget_args', 'custom_woocommerce_product_subcategories_args' );

function custom_woocommerce_product_subcategories_args( $args ) {

$args['exclude'] = get_option( 'default_product_cat' );

return $args;

}

works for me

This works for me, thank you!

For the sidebar widget, the other solutions did not work for me. I had to remove the category id from $args[Include]

add_filter( 'woocommerce_product_categories_widget_args', 'custom_woocommerce_remove_uncategorized_category_sidebar' );

function custom_woocommerce_remove_uncategorized_category_sidebar($args)
{
   
    if (!empty($args['include']) && is_string($args['include']))
    {
        $included_categories = explode (",", $args['include']);
        $uncategorized_id = array_search(get_option('default_product_cat'), $included_categories);
        if ($uncategorized_id)
        {
            unset($included_categories[$uncategorized_id]);
            $args['include'] = implode(",", $included_categories);
        }
    }

    return $args;
}

Goes in functions.php or plugin.