After having used Gnome Shell for about two weeks, I had got accustomed to the Activities button and the hot corner associated with it. If you do not know what a hot corner is, here is the layman’s definition: Any corner of the screen which triggers an onscreen response when a mouse is moved over to that particular place, is called a hot corner!
The left top corner is by default a hot corner for Gnome Shell. It displays thumbnails of all open windows when mouse is moved over there. Please remember it works only for open windows which are not minimized.
So, once I switched back to Unity, I wanted the same functionality as I kept moving my mouse to the top left corner to get all my windows! I had used this functionality before, in Ubuntu 10.10 and I knew where to find it! Easiest way to achieve this is by using a setting in Ubuntu Tweak. I am sure almost all of you will have Ubuntu Tweak installed. If not, then
In Ubuntu Tweak , this option can be found inside Compiz Settings under Desktop. There, under sub-menu Workspace Edge Settings, from the dropdown menu of the top left menu, I selected Show Windows. That’s it! I was able to enjoy the same functionality as Gnome Shell to show all open windows.