hide-products-function.php

function healthyliving_remove_product_cats( $query ) {

	$hidden_shop_categories = get_field('hidden_shop_categories', 'option');

		// Comment out the line below to hide products in the admin as well
		if ( is_admin() ) return;

		if ( $query->is_search ) {

			$query->set( 'tax_query', array(
				array(
					'taxonomy' => 'product_cat',
					'field' => 'term_id',
					'terms' => $hidden_shop_categories,
					'operator' => 'NOT IN',
				)
			) );
		}
}
add_action( 'pre_get_posts', 'healthyliving_remove_product_cats' );