GNOME shows activities overview when mouse hover dash

I got this weird bug recently: When mouse-hovering the dash panel, the activities overview shows up. Why is that? (I'm using "dash to panel" extension).

I'm using Ubuntu 17.10

Solution 1:

Use GNOME Tweaks to turn off Activities Overview Hot Corner. If Tweaks is not installed, type in bash:

sudo apt install gnome-tweak-tool

Then open Tweaks -> Top Bar -> turn off Activities Overview Hot Corner.

Solution 2:

Activities getting activated by mouse hover at the top-left corner is in fact a default GNOME shell behaviour. But in Ubuntu 17.10 it's patched not to do so.

I reckon by installing Dash to Panel (or some other extension(s)/package(s)) you have broken the patch somehow.

You may use a GNOME shell extension called No Topleft Hot Corner to disable this hot corner feature.