How to Hide Quill Booking Admin Menus

function plt_hide_quillbooking_menus() {
	//Hide "Tools → Scheduled Actions".
	remove_submenu_page('tools.php', 'action-scheduler');

	//Hide "Quill Booking".
	remove_menu_page('quillbooking');
	//Hide "Quill Booking → Dashboard".
	remove_submenu_page('quillbooking', 'quillbooking');
	//Hide "Quill Booking → Calendars".
	remove_submenu_page('quillbooking', 'quillbooking&path=calendars');
	//Hide "Quill Booking → Bookings".
	remove_submenu_page('quillbooking', 'quillbooking&path=bookings');
	//Hide "Quill Booking → Availability".
	remove_submenu_page('quillbooking', 'quillbooking&path=availability');
	//Hide "Quill Booking → Integrations".
	remove_submenu_page('quillbooking', 'quillbooking&path=integrations');
	//Hide "Quill Booking → Settings".
	remove_submenu_page('quillbooking', 'quillbooking&path=settings');
}

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

Where do I put this code?