function plt_hide_instantio_menus() {
//Hide "Instantio".
remove_menu_page('wiopt');
//Hide "Instantio → Dashboard".
remove_submenu_page('wiopt', 'ins_dashboard');
//Hide "Instantio → Settings".
remove_submenu_page('wiopt', 'wiopt#tab=general');
//Hide "Instantio → Upgrade to Pro".
remove_submenu_page('wiopt', 'https://themefic.com/instantio/go/upgrade');
}
add_action('admin_menu', 'plt_hide_instantio_menus', 11);