I use LightDM with XFCE, and the "Switch User" option is disabled.
I tested the following fix, and it works perfectly: https://wiki.archlinux.org/index.php/LightDM#User_switching_under_Xfce4I think this is a bug in Fedora's packaging. Either xfwm4 should be patched to look foreither gdmflexiserver or dm-tool, or gdmflexiserver should be a wrapper that looks at where the display-manager.service alias is pointing to, and invoke the appropriate switcher.
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