That setting doesn't show for all project it seems. But when I found it, hovering over the ? says:
This will be the email address presented to users when they are authenticating with Google. It can be changed to your signed-in email or an email of a Google Group managed by you.
So it looks like you'll need to:
Step 3 might not be needed, since I can also see the email addresses of team mates in my test project.