@handrawn - thanks.
@Nancy, as @handrawn says, 0px shows as a 1px line at whatever scale on the design page only.
The No Fill approach beats the 99% Transparency as that fades out any Line width so it is hard to see the extent of the shape.
The down-side is you can only marquee select a No Fill shape or select it by clicking on its Line.
A 99.5% Transparency is also very hard to catch; a 99% Transparency Black can just be seen.
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