This plasmoid shows a menu of the open windows in all activities and all desktops. This list can be filtered on the title of the windows. Selecting an item in the list activates the corresponding window and switches to the activity and desktop on which this window is located.
The plasmoid can be completely manipulated with the keyboard. To select a window, move to it with the "Up" and "Down" arrow keys and press "Enter". To filter the windows by their titles, just start typing the title.