Width Inaccuracy vs. Voxel Size

While doing the ‘Survival Shooter’ tutorial by Will Goldstone, Mike Geig, and James Bouckley - I came across something…

Their Navigation window looks different. At least under the ‘advanced’ setting.

Here’s the tutorial’s “Navigation” window:

Here’s a screenshot of my “Navigation” window:

In the tutorial, he says to “bring the Width Inaccuracy to 1%”. My Navigation pane only shows “Voxel Size”. How does that change things for me?

Thanks in advance

It was removed in Unity 5.0
You can see how to use the new setting here: Unity - Manual: Advanced NavMesh Bake Settings