How to eliminate highlighted border on offset surface part?

I needed to create a thin shell around a specific region of a part, and used the "Offset Surface" function to do so. I was able to create the part, modify its appearance, all that jazz. But for some reason the external edges of it are all highlighted in blue, and I'd like to turn that off. I'm using SOLIDWORKS 2016 SP5.0, what should I do?