Here is how you fix that superkey issue in XFCE.

I know there’s probably more solutions to the problem, but this is the one I went with as I found it easy enough.
We’re going to use something called ksuperkey that will change the superkey keypress in to a ALT+F1 press.
I super recommend you watch this video if you need more clarification and like the video if you found it clarifying.

  1. Install dependencies 
    sudo apt install git gcc make libx11-dev libxtst-dev pkg-config -y
  2. Go to your downloads folder
  3. Clone the ksuperkey repository
  4. Install it with a bunch of make commands 
    cd ~/Downloads
git clone https://github.com/hanschen/ksuperkey
cd ksuperkey
sudo make
sudo make install

  5. Run it and add it to startup commands

    Simply start it by running the ksuperkey command.
    Also add it to Sessions and Startup > Application Autostart settings.

  6. Change the keyboard shortcut

    Finally you’re going to need to change your keyboard shortcut. In Keyboard settings > Application Shortcuts you want the following:

    Command Shortcut
    xfce4-popup-whiskermenu ALT+F1

    Obviously it doens’t have to be the whiskermenu, it can be whatever you want.

Have fun.