Hi Tim,
Thank you for your attention to my problem!
The problem is partially solved the disappearance of the shadows. Change the “r.Shadow.TekselsPerPiksel = 5” gives a good result, but not for all objects in the scene. Objects created from “Box Brush” have no effect. Just changing this setting is not saved for the project. If you know how to save them, please let me know?
The other issue with screen space reflections, I did everything you said, but changes settings under Screen Space Reflections do not produce the desired result. When you turn the camera angle, reflection still disappear. UE4Problems2 - YouTube.