Switch between fingerprint and password sign in options in windows 8

In windows 8 I noticed the following on my laptop:

When I am on the lock/login screen I can swipe my finger at any time and it will allow me to pass the screen. This is quite convenient.

However, when I last used my laptop fingerprint scanner, and am now working with an external screen and keyboard, things are not so nice. I can basically choose one of these 2 options:

  1. Click on sign-in options, then click on password
  2. Open the lid of my laptop, and swipe my finger anyway

Notably, this is NOT an option:

  1. Start typing my password directly

Now I have the following question:

Why is it so hard to switch from fingerprint sign on to password sign on in the windows 8 login screen?