I use firebase signInWithRedirect with google for signin, back button is not visible

I click on button for login in google signin (open google login), if login is in error (error google), the back button for return app is not visible.
I Use IOS.

import { AngularFireAuth } from 'angularfire2/auth';
import * as firebase from "firebase";

constructor(private afAuth: AngularFireAuth) {
 }

public onLoginGoogle() {
	const provider = new firebase.auth.GoogleAuthProvider();
	this.afAuth.auth.setPersistence(firebase.auth.Auth.Persistence.LOCAL)
		.then((result) => {
			return this.afAuth.auth.signInWithRedirect(provider);
		})
		.then((result) => {
			return this.afAuth.auth.getRedirectResult();
		})
		....
}

Tnx

PWA or Hybrid Mobile App?

Hybrid Mobile App

my Ionic info:

Ionic:

ionic (Ionic CLI) : 4.1.2 (/usr/local/lib/node_modules/ionic)
Ionic Framework : ionic-angular 3.9.2
@ionic/app-scripts : 3.1.11

Cordova:

cordova (Cordova CLI) : 8.0.0
Cordova Platforms : android 7.0.0, ios 4.5.5
Cordova Plugins : cordova-plugin-ionic-keyboard 2.0.5, cordova-plugin-ionic-webview 1.1.1, (and 25 other plugins)

System:

Android SDK Tools : 26.1.1 (/opt/mobile/android/android-sdk-macosx)
ios-deploy : 1.9.2
NodeJS : v8.12.0 (/usr/local/Cellar/node@8/8.12.0/bin/node)
npm : 6.2.0
OS : macOS High Sierra
Xcode : Xcode 9.4.1 Build version 9F2000

Tnx