Inspector has no layer and transform has no z-axis

I have no clue for what reason my Inspector just randomly lost its Layer selector and also the Transform lost z-axis like below. Any idea?

Sorry if my English sucks.171058-inspector.png

Okay I have figured it out. According to @Hellium, this is due to the Unity Playground asset that I’m using. In fact, I want to edit the Layer Collision Matrix though it seems not possible in my case. Anyway, I’ll create a script and call Physics2D.IgnoreCollision instead.