First, I want to say a big ol' THANK YOU for figuring out a workaround for this issue. The only help Squarespace provided was sending me the link to your answer above!
This code successfully removed the sidebar containing template verbiage that was not able to be edited any other way. As a domino effect, it impacted the formatting/alignment of the shopping cart product items (I've attached a picture so you can see what I mean). I'm curious if you faced the same domino effect and if so, how you resolved it. I have ZERO coding experience so your expertise is greatly appreciated! Thanks again!