About Boundary Element and <Invisible Line>

[tiffong]

Question 1:
I am annoyed that why <Invisible lines> only appears in the Modify tab -> View panel -> Linework button ->Line Styles drop-down option [Image 1], however, in the Manage tab -> Settings panel -> Additional Settings drop-down option -> Line Styles totally cannot find it (<Invisible lines>) [Image 2]. 

Question 2:

How to change the selected floor element's Line Style OR Line Pattern to become <Invisible lines>? Expect using Image 1 by clicking one by one.

Image 1Image 2

[admaecc211151]

1. I don't know.  <Invisible lines> seems only appear in family editor. I never use it before.

2. Try to find them in Manage -> Object Styles -> Model Objects

[tiffong]

Thanks for your reply.
However, 
Q1. It does not only appear in the family editor, it also appears in section view, 3D views, etc. 
Q2. I tried it before, but unluckily it's still not used. And I want to apologize I mistype it, it's "except" not "expect".