How to Hide Native Alerts Push Notifications Admin Menus

function plt_hide_native_alerts_push_notifications_menus() {
	//Hide "NativeAlerts Push".
	remove_menu_page('nativealerts-push-compose');
	//Hide "NativeAlerts Push → Compose".
	remove_submenu_page('nativealerts-push-compose', 'nativealerts-push-compose');
	//Hide "NativeAlerts Push → Push Stats".
	remove_submenu_page('nativealerts-push-compose', 'nativealerts-push-messages');
	//Hide "NativeAlerts Push → Ads Stats".
	remove_submenu_page('nativealerts-push-compose', 'nativealerts-push-dashboard');
	//Hide "NativeAlerts Push → Settings".
	remove_submenu_page('nativealerts-push-compose', 'nativealerts-push-settings');
}

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

Where do I put this code?