Hide products from certain categories on the shop page

add_action('pre_get_posts', 'exclude_products_from_categories');
function exclude_products_from_categories($query) {
    if (is_shop() && $query->is_main_query()) {
        $excluded_categories = array(7, 8, 9); // Kategorien, die ausgeschlossen werden sollen
        $query->set('tax_query', array(
            array(
                'taxonomy' => 'product_cat',
                'field' => 'id',
                'terms' => $excluded_categories,
                'operator' => 'NOT IN',
            ),
        ));
    }
}