The Zoom Parameter in the Paste Canvas layer allows you do zoom in or out on the contents of the encapsulated layers.
The default value of 0 is no zoom at all. Positive values zoom in, and negative values zoom out.
The zoom is exponential - each increase of 1 in the zoom parameter zooms in by a factor of 2.72, so a zoom of 2 will zoom in by a factor of 2.72 * 2.72 or around 7.4 times. Zooming out is equally as severe.