I think I know what you're talking about, but this skin doesn't have like one variable that controls the borders/margins of the whole skin.
For example, if you were to add a text or a string on the right side of the RAM percentage meter, then the border/margin would now be wider because you've added something further out to the right. Get it?
To see your current border/margins, change the BackgroundMode and SolidColor as I've mentioned earlier.
BackgroundMode=2
SolidColor=0,0,0,100
You can drag and right click open areas as long as it is within the border/margins when the BackgroundMode is 2.