Where can I find the option for the sorting layer in Unity 2017?

I’m currently using the unity 2017.3.0f3 personal.

I want to change the order of sprites, but I cannot find the option for the “sorting layer” in sprite renderer, and it is also not in sorting group.

Where can I find it?

I couldn’t find it for an hour… please help me…

Press the indicated button (look the image i’ve attached) and change it to Normal, the option will appear on the sprite renderer inspector.