prevent google credentials save in android

I am using Firebase Google Authentication services. Authentication is working fine, But the problem is that when I sign In with google auth, credentials get saved. So after every logout, I can not be able to choose an email for login. It directly login me into the app. So it becomes a problem for me when I want to login with another Gmail account.

Code to achieve the credentials page.

google_sign_in_btn.setOnClickListener {
            signIn()
        }
  ...


private fun signIn() {
    val signInIntent = mGoogleSignInClient.signInIntent
    startActivityForResult(signInIntent, 234)
}


override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)

        if (requestCode == 234)
        {
            val task = GoogleSignIn.getSignedInAccountFromIntent(data)
            try
            {
                val account = task.getResult(ApiException::class.java)
                if (account != null) {
                    firebaseAuthWithGoogle(account)
                }
            }
            catch (e:ApiException) {
            }
        }
    }