I installed gnome on my system and now I wanted to install KDE alongside to it to be able to switch between DEs freely.
So I installed KDE
sudo pacman -Syu plasma dolphin konsole
but now I don’t know how to switch to KDE. Keep in mind that I have autologin and if I logoff I don’t have the button to change DE. So I must have forgotten to install something.
Some desktops play nice together and others don’t. Gnome and KDE fall into the latter category and I wouldn’t recommend that you install them side by side, but rather test one in a vm or on a different drive altogether.