I have been racking my brains searching through every private General/CoreGraphics header I can find… but to no avail. Does anyone know how to adjust the opacity/strength of a window’s shadow? Thanks in advance.

—-Why do you need to do this?

—- Trust me when I say you don’t want to know, but it’s important.

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You may wish to simply disable the shadow, then draw your own shadow using a child window. Not a perfect solution but it will be compatible with future OS versions (insert standard warning about using private function calls here. Please don’t).