<Super>+d doesn't work for Show Desktop
Super+d doesn't work for Show Desktop. The closest that I could get was Alt+d, because ctrl+alt+d is too much. I tried to make it work by manually editing the show_desktop_key in ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml and rebooting over and over, but it doesn't work at all. Unless for +e for thunar or +c for xfce4-popup-clipman which is, btw, very handy to manage transfer area.
$ uname -a Linux fedora 6.7.7-200.fc39.x86_64 #1 (closed) SMP PREEMPT_DYNAMIC Fri Mar 1 16:53:59 UTC 2024 x86_64 GNU/Linux
xfce4-about -V xfce4-about 4.18.5 (Xfce 4.18)