I played in the preferences for the panel. (right click on menu button > preferences) Doing so, I must have done a change that I do not find back. Before "playing" in the preferences I saw always the running applications in the panel. Clicking on them I could change to the one I wanted to use. Now the applications are not to be seen anymore in the panel.
Where in the preferences do I have to make which change to have the running applications shown again in the panel?
Thanks in advance for your help!