How to Hide Zephyr Project Manager Admin Menus

function plt_hide_zephyr_project_manager_menus() {
	//Hide "Zephyr Project Manager".
	remove_menu_page('zephyr_project_manager');
	//Hide "Zephyr Project Manager → Dashboard".
	remove_submenu_page('zephyr_project_manager', 'zephyr_project_manager');
	//Hide "Zephyr Project Manager → Projects".
	remove_submenu_page('zephyr_project_manager', 'zephyr_project_manager_projects');
	//Hide "Zephyr Project Manager → Tasks".
	remove_submenu_page('zephyr_project_manager', 'zephyr_project_manager_tasks');
	//Hide "Zephyr Project Manager → Files".
	remove_submenu_page('zephyr_project_manager', 'zephyr_project_manager_files');
	//Hide "Zephyr Project Manager → Activity".
	remove_submenu_page('zephyr_project_manager', 'zephyr_project_manager_activity');
	//Hide "Zephyr Project Manager → Calendar".
	remove_submenu_page('zephyr_project_manager', 'zephyr_project_manager_calendar');
	//Hide "Zephyr Project Manager → Categories, Priorities & Statuses".
	remove_submenu_page('zephyr_project_manager', 'zephyr_project_manager_categories');
	//Hide "Zephyr Project Manager → Devices".
	remove_submenu_page('zephyr_project_manager', 'zephyr_project_manager_devices');
	//Hide "Zephyr Project Manager → Teams & Members".
	remove_submenu_page('zephyr_project_manager', 'zephyr_project_manager_teams_members');
	//Hide "Zephyr Project Manager → Get Premium".
	remove_submenu_page('zephyr_project_manager', 'zephyr_project_manager_purchase_premium');
	//Hide "Zephyr Project Manager → Help".
	remove_submenu_page('zephyr_project_manager', 'zephyr_project_manager_help');
	//Hide "Zephyr Project Manager → Settings".
	remove_submenu_page('zephyr_project_manager', 'zephyr_project_manager_settings');
}

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

Where do I put this code?