In the first picture I clicked on "Select" -> "Feather..." but it seems the selection is instead smoothed. If I try "Select" -> "Smooth..." I obtain the same result.
On the other hand, if I go into "Refine", changing the "Feather" slides has the effect that I was looking for (see second picture).
Is this something intended to work this way and I'm doing something wrong or is it a bug?
I'm on macOS 11.4 and I'm using Affinity Photo 1.10.0
Thank you,
Giacomo