Boot into xfce4 Desktop after offline install... update system:
eos-update
reboot to be up to date… (there will be kernel update)
Remove all XFCE4 packages:
cd Downloads
wget https://raw.githubusercontent.com/endeavouros-team/EndeavourOS-packages-lists/master/xfce4
sudo pacman -Rc - < xfce4
install KDE:
eos-packagelist --install "KDE-Desktop"
Best will be to create a “dummy” user on initial offline install and create a new user now (to keep it simple) it willl use settings for kde in this case for the new user only old one will not get them.
sudo useradd -m -G wheel,sys,rfkill -s /bin/bash username
replace username with the one you want 😉
sudo passwd username to create a password for the user…
sudo systemctl -f enable sddm to use the kde login manager (DM)
reboot … login as the new user and if it works remove old user and its home:
sudo userdel oldusername
sudo rm -R /home/oldusername