Remove a specific category from the category widget (sidebar) in WooCommerce

functions.php

//Remove the Black friday category from category widget
function jagels_exclude_widget_categories($args){
    $exclude = "99"; // The IDs of the excluding categories separated by commas.
    $args["exclude"] = $exclude;
    return $args;
}
add_filter('woocommerce_product_categories_widget_args','jagels_exclude_widget_categories');