Making a blog post wider

I have found https://support.wix.com/en/article/making-your-blog-feed-or-custom-feed-full-width-in-the-new-wix-blog, https://support.wix.com/en/article/stretching-an-element-to-full-width, and https://support.wix.com/en/article/adding-a-sidebar-to-the-post-page-in-the-new-wix-blog all of which seem to have something to do with changing the page width but none of them seem to do what I want. When I am in the editor viewing a blog entry and mark it stretched I see the page borders widen but the post itself stays the same width. How can I make the actual text in the blog post wider?

This is very frustrating. My blog posts typically have code snippets in them. It does not appear that I can change the font within the code snippet to make it smaller, nor can I change the page width so the code wraps in the text box which makes it difficult to read.