I'm new to Unity. I've been tasked with adding functionality to a game options menu object and so I'm adding some sliders and check boxes, etc. The menu is instantiated in code, which loads the menu prefab. To add the items, I've added the prefab to a random scene, thinking I'd change the prefab, save it, and revert the scene. I can't seem to figure out how to save the prefab changes though. I've added the changes I need, so how do I save the .prefab file?