Window grouping can be a big help in keeping your Window List from becoming overcrowded. When you have multiple windows of the same application (such as your web browser) open, only the application name will show in the window list. When selected, a dropdown will list all open windows for that application, which makes it easier to find the one you are looking for.
1. Right-click the Window List portion of your panel.
2. Select Preferences.
3. When the Window List Preferences window appears, go to the Window Grouping section. Select either the Group windows when space is limited or the Always group windows radio button.
4. Click the Close button.