Q&A Plugin: how do I edit page type of questions(posts)?

Hi, how do I edit page type of questions once posted?

I managed to get my /questions/ask portal centered on a "One Column, No Sidebar" page, but my /questions page and my /questions/sample_question page both have their own page types - so...how can I keep ALL Q&A content on the SAME page type?

Note: When I go to Questions> Settings> Theme Adaptation Settings and make adjustments, my theme didn't appear to respond well to sidebar vs content adjustments...

Help? Thanks