How can I set on the SmartTV that when you press log on a logged Netflix account, not already the e-mail address is displayed?

So the first time the email field and the password field is empty. But if you were already logged in at least once successfully and then logged out and maybe later someone else wants to log in, then he sees who was previously logged in on the same TV, that should not be.

So how do you empty the e-mail field, so that the next does not see which e-mail address was previously logged in?

This is not possible