<https://forum.affinity.serif.com/index.php?/topic/64651-how-to-have-a-transparent-stroke/#comment-336175>
<http://schema.org/text>
"If the above answer is not what you meant (I think you might mean something slightly different, because making the stroke transparent will reveal the shape behind again), then there is another way involving subtracting shapes.  \n\tFirst make sure the shape with the stroke is converted to outlines. Then under the Layer menu, select 'expand stroke'. This will make the stroke into an object of it's own. You can then duplicate this outline object and use the subtract tool to subtract it from any shapes that it overlaps - I say duplicate because you'll also need to subtract it from it's original fill shape to maintain the 'outline' thickness. That will give you a completely transparent space that was the thickness of the original stroke. You'll need to duplicate the outline shape for each shape that you need to subtract it from, as the subtract method removes the shape that is being subtracted. \n \n\n\n\t \n \n"
<https://forum.affinity.serif.com/index.php?/topic/64651-how-to-have-a-transparent-stroke/#comment-335894>