Hide Product Categories

hide-categories.php

function custom_pre_get_posts_query( $q ) {
    $tax_query = (array) $q->get( 'tax_query' );
    $tax_query[] = array(
           'taxonomy' => 'product_cat',
           'field' => 'slug',
           'terms' => array( 'PUT THE CATEGORY TO HIDE HERE' ), // Don't display products in the this category on the shop page.
           'operator' => 'NOT IN'
    );
    $q->set( 'tax_query', $tax_query );
}
add_action( 'woocommerce_product_query', 'custom_pre_get_posts_query' );