Help with scaling a part size.

[ShireBrickz.com]

Looking for help on how to scale a parts size.

I've created a sticker using this https://wiki.ldraw.org/wiki/Stickers:_ma..._shape_one tutorial as a guide.

Whilst the sticker I've created is the correct thickness, the size is too small. Is there a way to scale the part in the X,Y planes proportionally to my desired size in LDU's whilst leaving the Z thickness unchanged.?

Thanks in advance.
Adam