How to Hide Alnora - Booking for Private Clinics Admin Menus

function plt_hide_alnora_clinic_menus() {
	//Hide "Alnora".
	remove_menu_page('alnora-clinic');
	//Hide "Alnora → Dashboard".
	remove_submenu_page('alnora-clinic', 'alnora-clinic');
	//Hide "Alnora → Appointments".
	remove_submenu_page('alnora-clinic', 'alnora-clinic-appointments');
	//Hide "Alnora → Doctors".
	remove_submenu_page('alnora-clinic', 'alnora-clinic-doctors');
	//Hide "Alnora → Services".
	remove_submenu_page('alnora-clinic', 'alnora-clinic-services');
	//Hide "Alnora → Patients".
	remove_submenu_page('alnora-clinic', 'alnora-clinic-patients');
	//Hide "Alnora → Settings".
	remove_submenu_page('alnora-clinic', 'alnora-clinic-settings');
	//Hide "Alnora → Shortcodes".
	remove_submenu_page('alnora-clinic', 'alnora-clinic-settings-shortcodes');
	//Hide "Alnora → Booking rules".
	remove_submenu_page('alnora-clinic', 'alnora-clinic-settings-booking');
	//Hide "Alnora → Email  reminders".
	remove_submenu_page('alnora-clinic', 'alnora-clinic-settings-email');
	//Hide "Alnora → GDPR".
	remove_submenu_page('alnora-clinic', 'alnora-clinic-settings-gdpr');
}

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

Where do I put this code?