How to Hide Planaday Connector Admin Menus

function plt_hide_planaday_connector_menus() {
	//Hide "Planaday Connector".
	remove_menu_page('planaday-connector-admin');
	//Hide "Planaday Connector → Welkom".
	remove_submenu_page('planaday-connector-admin', 'planaday-connector-admin');
	//Hide "Planaday Connector → Algemene Instellingen".
	remove_submenu_page('planaday-connector-admin', 'planaday-connector-general-settings');
	//Hide "Planaday Connector → Cursus Instellingen".
	remove_submenu_page('planaday-connector-admin', 'planaday-connector-course-settings');
	//Hide "Planaday Connector → Boeking Instellingen".
	remove_submenu_page('planaday-connector-admin', 'planaday-connector-booking-settings');
	//Hide "Planaday Connector → Betaling Instellingen".
	remove_submenu_page('planaday-connector-admin', 'planaday-connector-payment');
	//Hide "Planaday Connector → Database".
	remove_submenu_page('planaday-connector-admin', 'planaday-connector-database');
	//Hide "Planaday Connector → Stijl".
	remove_submenu_page('planaday-connector-admin', 'planaday-connector-css');
	//Hide "Planaday Connector → Support".
	remove_submenu_page('planaday-connector-admin', 'planaday-connector-support');
}

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

Where do I put this code?