Once again Thank You very much for all Your help !
I really hate to bother you again but I must admit (with shame) that even with google I couldn’t manage to make that shadows work. I googled and found “mesh distance field resolution” and I tried adding higher numbers in both meshes that are casting and that are receiving shadows but this didn’t work. When I typed 2 in mesh resolution there was very slight change, so I tried 5 and there was no further change even with 20 and 40 multplier.
I tried searching for other settings in my LPV and my Project and World settings but I didn’t find anything attached to Mesh resolution 
Can You tell me what I am doing wrong ?