I have a shapefile which contains many polygons and because I work on a large geographical extent, I'd like the polygons to be slightly bigger, for presentation purposes. Basically keep their extent and enlarge them by, say, 30% for example. I was thinking of using the SAGA "transform vector layer" tool. However I get lost when I need to put the X and Y coordinates, as shown in the picture below:
I understand that the scale factor will enlarge the polygons by whatever factor I want, but when it comes to the X and Y I wonder what I should put. I can't seem to find the x and y coordinates of my shapefile. I read this post Enlarge a Polygon without changing its shape or position but it gives details for doing so for just on polygon.