How can I disable the Windows key from opening the Activities overview?

  • gnome-tweak-tool > Keyboard and mouse > Switch between overview and desktop offers only 2 options:

    1. Left super, Default
    2. Right super

    enter image description here
    Switching the option to 'Right super' should do the trick.

  • However you may set up custom shortcut using:

    dconf write /org/gnome/mutter/overlay-key "'Alt_R'"
    

    or

    gsettings set org.gnome.mutter overlay-key 'Alt_R'
    

You can disable it by doing:

gsettings set org.gnome.mutter overlay-key ""