Noob having issues with Sky Spheres

I’m somewhat new to Unreal Engine 4 and still don’t know much about all of its features. Recently, while working on a project to create a Simulation of a Mars rover, I changed the BP_Sky_Sphere in order to better fit a Mars atmosphere. In doing so, I got colors that I’m not satisfied with and, after I created a new project, realized that the same sky sphere had carried over to that project, I presume that this is because the BP_Sky_Sphere blueprint is located in the Engine Content>Engine Sky directory and I was wondering if there is a way to reset the BP or if I need to create a new one.