You mean from the Login Screen? That is not from me; that is from the User @zenzen. I would guess it is from a Virtual Machine maybe. That was that what I have already linked above to show You.
that is not what I've shown You. this means that Automatic Login is active - and then You can't choose Wayland or Xorg.
Yes, that is right. And when You have to type in Your Password and the Password Field is there, you should see the Gear Icon.
Okay, I go a bit more out. Does the whole custom.conf File include all this?
# GDM configuration storage
#
# See /usr/share/gdm/gdm.schemas for a list of available options.
[daemon]
# Uncomment the line below to force the login screen to use Xorg
#WaylandEnable=false
# Enabling automatic login
# AutomaticLoginEnable = true
# AutomaticLogin = user1
# Enabling timed login
# TimedLoginEnable = true
# TimedLogin = user1
# TimedLoginDelay = 10
[security]
[xdmcp]
[chooser]
[debug]
# Uncomment the line below to turn on debugging
# More verbose logs
# Additionally lets the X server dump core if it crashes
#Enable=true