It’s in the switches for each layer:

You want the jagged line to be smooth, like this:

(This second is the default, by the way, but there’s a chance you accidentally toggled it….)
You can also try applying a slight blur to the jagged object. I’d use the Fast Blur filter, maybe set to 0.5 or something. In fact, a slight blur + a little grain can help “smooth” out a lot of things!
Ben Unguren
Motion Graphics & Editing
http://www.mostlydocumentary.com
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