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.secondary-navigation .menu-toggle {
      display: none;
}

@media(max-width: 768px) {
    .secondary-navigation {
        text-align: center !important;
    }
    .secondary-navigation ul {
        display: block;
    }
    .secondary-navigation .sf-menu>li {
        float: none;
        display: inline-block !important;
    }
}

add_action( 'wp_enqueue_scripts', 'generate_dequeue_secondary_nav_mobile', 999 );
function generate_dequeue_secondary_nav_mobile() {
    wp_dequeue_style( 'generate-secondary-nav-mobile' );
}