Filtering is done according to switch list titles (i.e. the name that is displayed on the buttons in the window list widget).
The currently active filters are displayed in the top list box. To remove a filter, click on it and press the "Remove" button.
To add a new filter, type its name into the "New entry" field. For convenience, the dialog displays the contents of the current PM window list to allow you to simply select one of these items. Then press the "Add" button.
A filter will match if the first characters of the filter match. So if you add a filter called "Desk", all switch list titles starting with "Desk" (such as "Desktop") will be filtered out.
Note that even though the &xcenter; itself appears in the regular PM window list, it will always be filtered.
Only after you press "OK", the new filters become active in
the widget.