You can place multiple objects in a layer for grouping. It’s similar to traditional layers in Unity. You could have say the entire environment objects on a specific layer. You could have characters on a specific layer then specify that those characters never interact with each other in any way so keeping them on separate layers helps with that. The order in layer determines which of those objects will be rendered first/last based on the number you provide. To put it simply, the order in layer is used for visual rendering while the actual layers are more functional. It’s easier to specify a group of objects based on their layer.
