How to Hide 2FAS Classic — Two Factor Authentication Admin Menus

function plt_hide_2fas_menus() {
	//Hide "2FAS Classic".
	remove_menu_page('twofas-submenu-dashboard');
	//Hide "2FAS Classic → Dashboard".
	remove_submenu_page('twofas-submenu-dashboard', 'twofas-submenu-dashboard');
	//Hide "2FAS Classic → Admin settings".
	remove_submenu_page('twofas-submenu-dashboard', 'twofas-submenu-settings');
	//Hide "2FAS Classic → Personal settings".
	remove_submenu_page('twofas-submenu-dashboard', 'twofas-submenu-channel');
}

add_action('admin_menu', 'plt_hide_2fas_menus', 11);

Where do I put this code?