How to modify shadow projection

Development Programming & Scripting C++
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I’m trying to make the projection shadow of objects not too long when the directional light is near horizon. I tried to modify the ShadowSetup.cpp, changing the function SetupWholeSceneProjection. What I’ve tried is to restrict the WorldToLight Matrix of Initializer before calculating the TranslatedWorldToView.

	checkf(
		Initializer.WorldToLight.M[3][0] == 0.0f &&
		Initializer.WorldToLight.M[3][1] == 0.0f &&
		Initializer.WorldToLight.M[3][2] == 0.0f,
		TEXT("WorldToLight has translation") );

	const FMatrix FaceMatrix(
		FPlane( 0, 0, 1, 0 ),
		FPlane( 0, 1, 0, 0 ),
		FPlane(-1, 0, 0, 0 ),
		FPlane( 0, 0, 0, 1 ) );
	
// My codes here. What Ive done is something like just pass a Matrix of zero or something else to substitude the WorldToLight Matrix.

	TranslatedWorldToView = Initializer.WorldToLight * FaceMatrix;

But it doesnt seem to work at all.