no-vacation-products-on-shop-page

add_action( 'pre_get_posts', function( $query ) {
    if(!$query->is_main_query()) return;

    if( is_shop() ) {
        $vacation_args = array(
            'role__in'   => apply_filters( 'wcfmmp_allwoed_vendor_user_roles', array( 'wcfm_vendor' ) ),
            'meta_query' => array(
                array(
                    'key'     => 'wcfmmp_profile_settings',
                    'value'   => ';s:18:"wcfm_vacation_mode";s:3:"yes";',
                    'compare' => 'LIKE',
                )
            ),
            'fields' => 'ID'
        );
        $on_vacation = get_users( $vacation_args );
        $vacation_posts = new WP_Query( array(
            'post_type' => 'product',
            'author__in' => $on_vacation,
            'posts_per_page' => -1,
            'fields' => 'ids'
        ) );
        $post_ids = array();
        if ( $vacation_posts->have_posts() ) {
            $post_ids = $vacation_posts->posts;
        }
        wp_reset_postdata();
        $query->set( 'post__not_in', $post_ids );
    }
}, 100 );