Set "Ubuntu On Xorg" by default globally but without preventing the choice of Wayland

On this site:

https://docs.fedoraproject.org/en-US/quick-docs/configuring-xorg-as-default-gnome-session/

I was told the way to set Ubuntu on Xorg by default in the file /etc/gdm3/custom.conf:

# 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 = 10DefaultSession=ubuntu-xorg.desktop[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

But it doesn't work.
The name ubuntu-xorg.desktop I took it from the path /usr/share/xsessions.
Uncommenting (as the guide explains) or not the WaylandEnable=false line, the DefaultSession=ubuntu-xorg.desktop line has no effect.

I don't want the option Wayland to disappear (uncommenting the line WaylandEnable=false), I just want that when creating any user (therefore for all users, therefore globally) Ubuntu on Xorg is selected as default is not Ubuntu (Ubuntu on Wayland).Which file should I go to touch?

Don't tell me /var/lib/AccountService/users/<user> because I've already pointed out that I want to set this option globally but I don't want a way that uses the /usr/local/sbin/adduser.local file to do this if there is an already foreseen and more appropriate method.