@MichaelZ: in case, map cannot be zoomed out/in to completely cover track in preview windows, this problem is still there, as I don't have currently working solution, sorry.
@Diddi, @Christian: ah you mean old popups and these new. Yes, then it's correct. Old popups remained as were before 3.4.0 plus now appear also new popups. My idea is to completely remove the old once, so for now, both stay in Locus so it's possible test how it works and how it should work.
And choosing of content is possible, but ...
http://help.locusmap.eu/responses/how-to-customize-poi-popup-introduced-in-v340@jusc, @gynta: main problem is your language as usually. I'll probably add new function to locus - optimize German language (skip every second letter)

. Oki, thanks, I'll add some break like to text.