Distance Filed Indirect Shadow Quality Issue

I am working on UE version 4.18.

I am facing problem on Distance Filed Indirect Shadow.

My steps :
First of all I had tick Generate Mesh Distance Feilds in Project Settings.
Next I had used Static Skylight and Turn my object Movable.
Next I had get Distance Field Indirect Shadow.

But I had issue in Quality of shadow.

Is there any way to get better Distance Field Indirect Shadow quality?

Below are images of my output.

I’m also interested in this because DFIS looks promising, but the quality is just a bit too low right now.