Its fields are enlarged to accommodate selection by touch. In Windows 8, the Logon Screen has changed.

(among other options) It looks like this on Windows 7:

In Windows Vista and Windows 7, when you apply this Group Policy setting, the Logon Screen, by default, will display an empty avatar and the two common fields to enter credentials. With the right Organizational Unit structure, it can be applied to presentation PCs, but not to normal desktops, to accommodate users in their personal computing experience, where appropriate. The setting can be applied to Organizational Units, containing computer accounts. Some of these have been around for a long time, like the Interactive logon: Do not display last user name group policy setting. They are located in Computer Configuration, under Windows Settings, Security Settings, Local Policies, Security Options:

Microsoft offers a couple of Group Policy settings you can use to change the default Logon Screen. Others change the default Logon Screen to accommodate for presentation PCs, flexworker desktops and other commonly shared IT equipment. Many Active Directory admins consider it unsafe to display the last users logon name on the Logon Screen, since it provides information on naming conventions, etc.

Remove last user logon windows 7