In case someone comes across this and is looking for these settings (like I was)
You have to
- On the left hand side, click “+Add Product” and select “Facebook Login” (it was at
the top for me) - See the new settings available on the left hand side
- You will now have these OAuth settings on that “Product Settings”

Additional Info: Make sure to add the Callback URL like http://localhost:3000 to the Valid OAuth redirect URIs field on the settings page of Facebook Login