Login screen can not be changed

how can the kde login screen be changed. Changing the setting in the kde system management->Login screen section for me simply have no effect.
I’m using 12.2 with kde 4.9.2 on a desktop pc.

You would need to open YaST (Enter Root Password) - System - /etc/sysconfig Editor - Desktop - Display Manager - DISPLAYMANAGER_KDM_THEME is set to openSUSE and needs to be set to blank (as in nothing there). This defines the theme to be used by kdm by default. If empty, the traditional login window is used (which lacks some features). Put it back to openSUSE if you find you can no longer select the desktop to be used or get a list of users to select from, all part of the openSUSE theme that we use by default.

Thank You,