Threaded view vs. Linear view

I'm not sure how it happened, but one of the Furums and all of the ones under it, are in the wrong view. I'm not sure if it's Threaded or Linear, but it's the wrong view. All the other Forums and sub-Forums have the correct view, but one Forum and its sub-Forums is not correct.

Is there a way to force a particular view, either Threaded or Linear, when someone enters a forum or sub Forum?

 

It's on the forum add/edit form.