The latest version of GNOME is included in the latest Fedora and Ubuntu. (It's hard to talk about this GUI stuff because I (and probably you) don't know the names of visual components.) On the top bar of the screen, "Activities" is on the far left. Next to it used to be the name of the application that had focus. If you clicked on that name, you would get a list of instances of that application, plus a couple of other potentially useful choices. When I have a lot of windows for a particular application, I sometimes use this to choose the instance I want to have focus. This feature is gone. You can still get a similar effect using Windows-Tab and Windows-DownArrow, but it is kind of awkward having to hold the Windows key. Furthermore, I find the description less useful. Am I the only one who cares about the loss of this feature? The word "Activities" has been replaced with a horizontal oval and a dot. I don't know what that change signifies. I don't even know how to interrogate GNOME about this.