Advanced Search with tree preservation (sort of) - HINT

[Spliff]

Thank you very much!

I had NOT found it, since I hadn't understood your, "Drag to expand beyond the last column header to show it.": drag WHAT (transitive verb > object needed?), and from WHERE? - and my eyes are not good enough anymore in order to distinguish 2 pixels from 1 pixel.

I made a screenshot then, and the screenshot finally showed it was 2 bars in parallel, not just one, so I finally could drag the second bar to the right... pfff! (So I spare you the screenshot) ;-)