"Layout Options" box - does this need a mod? (3.6.8)

[Kadence]

This is kind of a dumb question, but does the "Layout Options" box at the bottom of this forum require a plugin? Or is that default behavior if you add a skin? I've never added a style to my forum, so I don't know if just adding a style makes this automatic.

I've googled and searched this forum, but couldn't find an answer. I saw the show skin in postbit mod, though that seems to take user being able to select the layout as a given.

Also, how would the behavior of the Layout Options chooser relate to the style manager - for instance my forum has the Default Style, and the currently active style is a child of that style. To get something to show up as a layout option for users, does it matter where in the hierarchy a new style is added? As a child of the Default Style, as a grandchild of the Default Style, etc.

I have vB 3.6.8 PL2, but this forum uses 3.6.12 (which surprised me) so I think if it applies to this forum it would apply to 3.6.8 as well.