Distance Field Shadow Issue for UE 4.26.2 in Mac OS

Hi,I am a novice of UE editor.Recently,I learned workshop class by Epic Game Sam Deiter.
During practising within FMX17.uproject,there is a weird issue appeared for Distance_Field_Shadowing_Example_Map Level.

Check Generate Mesh Distance Fields in Project Settings
Check Distance Field Shadows for a Movable PointLight

The shadow disappear and when I visualize Mesh DistanceField in the Level viewport, it looks strange ,not a correct Mesh DistanceField view.

But the distance field shadow function succeful with UE 4.26 on Window 10 Operation System .(same uproject and level used in Mac OS!

To make the Distance Field work ,Is there any special setting for UE in Mac OS?