Disable the "hot corner" in the top-left of GNOME Shell
The top-left hot corner in GNOME Shell makes it easier to toggle the Activities Overview --- perhaps a little too easy. No Topleft Hot Corner simply disables the hot corner, so you don't have to worry about accidentally triggering Activities anymore when moving the mouse near the top-left of the screen. But you can still toggle the overview by clicking on the Activities button.
You can contact the maintainers of this package via email at
gnome-shell-extension-no-topleft-hot-corner dash maintainers at fedoraproject dot org.