Is there a way to reduce the passive/diffuse shadow only for the shadow catcher? I'm using Cycles Render.

Not that I don't like the cool diffuse shadow, but even for this simple cube render below I have to zoom too far out to remove sharp shadow edges at the edges of the image.

Render: render enter image description here

Here's the basic file I used:

try to reduce size to 0 where sun light has option max bounces below,but reduce size of the shadow of the sun to 0

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