On Fedora, you can choose for example GDM (Gnome Display Manager), SDDM (Simple Desktop Display Manager), LXDM (LXDE Display Manager), LightDM, KDM (KDE Display Manager), XDM (X Display Manager).
I like the old gdm display manager, is good and works great.
If you want to change it then use these commands:
[root@desk mythcat]# dnf install gdm
...
Complete!
[root@desk mythcat]# systemctl disable lightdm
[root@desk mythcat]# systemctl enable gdm
Failed to enable unit: File /etc/systemd/system/display-manager.service already exists and is a symlink to /usr/lib/systemd/system/sddm.service.
[root@desk mythcat]# systemctl disable sddm.service
Removed /etc/systemd/system/display-manager.service.
[root@desk mythcat]# systemctl enable gdm
Created symlink /etc/systemd/system/display-manager.service → /usr/lib/systemd/system/gdm.service.
[root@desk mythcat]# reboot
If you have problems with gdm display manager then you can read about settings here.The configuration file can be found in this file:
[root@desk mythcat]# cat /etc/gdm/custom.conf
# GDM configuration storage
[daemon]
# Uncomment the line below to force the login screen to use Xorg
#WaylandEnable=false
AutomaticLogin=mythcat
AutomaticLoginEnable=False
[security]
[xdmcp]
[chooser]
[debug]
# Uncomment the line below to turn on debugging
#Enable=true