Cutie-fy is a Customize+ preset that affects face bone scaling. It softens the eyes, adjusts the nose shape and forms the mouth into a soft moue.
It is meant as an alternative to installing a sculpt, and is made to work on Male Lalafell face 1 (and 101). Using it on other faces or modded face models (sculpts) is not intended but entirely possible, the result will just look different from the previews.