GRASS v.transform tool producing no results QGIS

I’m working on a simple polygon feature representing the Western Cape province of South Africa. My goal is to enlarge the polygon so it can stand out from the others.

To do so I’ve used the v.transform tool, but the output layer is empty. The picture below shows how I’ve computed the tool, I might be doing something wrong.

As I understand it:

X shift: I’ve put the x coordinate of the centroid of the polygon.

Y shift: same for the y coordinate

X scale: the factor by which I’d like to enlarge my polygon (I’ve used 130% for the example, according to another post: How to resize shapefile features proportionally in QGIS?)

GRASS GIS 7 region: my canvas extent.