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.

Image of my output.