[Theme: Nosh] Add sidebar to posts

Hi all,

We are using the Nosh restaurant theme, and want to add a sidebar to our posts. All of our posts are currently set to “full width”. I went to the Nosh Settings, under “Posts & Pages”, and under “Blog styled pages”, we changed the blog style settings from “Full Width” to “With Sidebar”. We saved the settings, but nothing changed on any of our posts.

What else are we missing? Is there a plugin that will do this, or is this not possible in the theme?

Thanks in advance.