ShadowBrush.BlurAmount

From Xojo Documentation

Property (As Double )
aShadowBrush.BlurAmount = newDoubleValue
or
DoubleValue = aShadowBrush.BlurAmount

New in 2020r2

Supported for all project types and targets.

The sharpness of the edge of the shadow.

Notes

The higher the number, the less sharp the edge of the shadow will be. The default value is 3.

Higher numbers may result in lower performance.