morris, I would have selected a scaling of 66.7% myself.
But the shadow is not a shadow of its own being, it is a shadow of the object. Both are linked and the change of one necessarily forces a change on the other. Clone your object and add a feathering and a transparency with the needed shadow colour. Then you can alter scaling and other aspects like an envelope to reflect an undulating surface. Far more versatile.
That's why the Page & Layer gallery and drag and drop is useful. Easy to use it flexibly and intuitively.
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