Offset from Corners Distance

In the “Navigation Testing Actor” settings, there is an “Offset from Corners Distance”.
I want to use it for navigation, but I can’t find it in the navigation settings (RecastNavMesh-Default).
How can I set it up?

Have you possibly found an answer to this question?

I believe it’s set to true by default in 4.27. You can find it in your DefaultEngine.ini