> Even since Gnome Shell was released, I've always used the Super key to show the app overview, however not only has that been disabled in this release, but I also can no longer set the Super key to do anything on it's own in the new keyboard shortcut settings.
Method 1: The Terminal Command (gsettings)
Bash: gsettings set org.gnome.mutter overlay-key 'Super_L'
(If your keyboard uses the right Super key instead, substitute 'Super_R'.
Bash: gsettings set org.gnome.shell.keybindings toggle-overview "['Super_L']"
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Method 2: Locking it in via dconf-editor (For persistence across screen locks)
Bash: sudo apt install dconf-editor
Open Dconf Editor from your app launcher (or run dconf-editor in the terminal).
Navigate to: /org/gnome/mutter/
Look for overlay-key, click on it, turn off "Use default value", and set the custom value to 'Super_L'.
Do the same for /org/gnome/shell/keybindings/toggle-overview if needed