[REQUEST]How to setup the Directional Light for Landscape and big mesh to activate shadows?

Development World Creation
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7

I found a forum showcasing how to modify the engine to control the shadows

https://forums.unrealengine.com/development-discussion/rendering/5920-shadows-disappear-with-increased-camera-distance

But where and how will I modify these codes?
I didn’t find anything like it in the config folder

r.Shadow.FadeResolution
r.Shadow.MinResolution
r.Shadow.TexelsPerPixel
r.Shadow.RadiusThreshold