Shadows and Quality

Hello, i have a question about shadow and quality UE4.
Can you tell me why the shadows are poorly displayed? in some places everything is fine
but as you can see in some places (for example, on a plate in the center) on it somehow strange shadows are displayed.
I thought that if I increase the value (Light map res) then it will help me but did not help =
I also use lightmass portal (from each side) and Lightmass Importance Volume.
Could you also tell me how to unscrew the settings of the shadows to the maximum ? (i use lighting quality: production and Engine Scalability Settings: Epic)

Have you checked this thread?

Hello, thanks for your reply and help ! I did not see this topic, now I looked and changed something in world settings… Now build light…time has increased greatly.
and another question I use the standard models and in the topic I understood so discussed the grid in 3d model but I have a standard object.
sorry if I do not understand something or I’m wrong D:

Hey, after 1.5/2 hours i think i have good result for me ^^ but rendering was a really long D: