1. Install the Gnome Shell Frippery extension
2. Disable overview displaying on mouse hovering on the top left corner by editing the file
/usr/share/gnome-shell/js/ui/panel.js:
Change reactive: true to reactive: false and it will disable the hot corner. You can still activate the overview screen by pressing the Super (Windows) key but I have noticed that this kills the bottom panel.Code:this._corner = new Clutter.Rectangle({ width: 1, height: 1, opacity: 0, reactive: true });