An outer shadow was always the shape's filled silhouette at the shadow's
opacity: an outline-only shape cast a solid block, a 40% fill cast a full
shadow that darkened it from behind, and lines (and outlines) cast none.
PowerPoint casts the shadow from the drawn shape: the filled part as
see-through as its fill (nothing for no fill) plus the outline, which is
now stroked into the shadow layer with the line's width, dash and opacity.
Wild synthetic set: combined effects slide (no-fill frame, 40% fill,
shadows) 21.88 -> 2.34.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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