Google Login Setting.

Login to Admin->Site Settings->Settings.

Here, you will be enable login with Google.

How to set up Google Social Login and What is Google Social Login Callback URL?

Setup Google Social login: https://www.cozmoslabs.com/docs/profile-builder-2/add-ons/social-connect/create-google-app-social-connect/

Callback URL:

if your domain is like that https://yourdomain.com/ then the callback URL is https://yourdomain.com/auth/google/callback

and

if your domain contents public like that https://yourdomain.com/public then the callback URL is

https://yourdomain.com/public/auth/google/callback