Missing Mist and Z in render layers I'm Really Confused, There is no Z and Mist under Render layers, I tried clicking what I could and still no clue why they are not there. I'm trying to put mist in the Simulation.
Enable mist and Z for the view layer.

For older versions of blender (2.79 or previous)

On the Scene tab(yellow circle), make sure that Z and Mist are checked(red circle).
Also, make sure that the render layer in the Scene tab matches the render layer in the node editor (green circle).
Z is now called Depth.