CHANGE - Login Window
1)
System > Preferences > Install & Remove Software
Install lightdm (KDM, GDM ....).
I did install lightdm.
2)
sudo update-alternatives --config lightdm-greeter
3)
sudo drakedm
select window manager (lightdm)
4) OK & submit restart service.
5) Restart system
Source Know How:
https://wiki.mageia.org/en/Display_Managers
Have a good day
Rene