Maybe I am in the minority that did not realize this about side scan. Saw it in an article. It took a couple times reading it for me to get it. Lol. Just sharing in case you didn't know this:

Anglers often mistakenly think when they set their side scan area to 40 feet they are scanning out 40 feet to either side. No not really. You'll notice our depth is around 23 feet. On the ranges on either side the bottom starts being drawn at 23 feet. What you are seeing is directly below the boat on the left and on the right. Then from there it starts scanning out. So really it is scanning out to the "side" roughly 17 feet. The depth alters how far "out to the side" it images. Because it has to look down and then out.