What locks the content area width?

[bootlegcoal]

Hi, I'd like to extend the width of articles. Currently seems like there are two columns in the content area with the right one being blank. I have ToC disabled. Is there some other setting? If its hard coded, what would I need to override? Thanks for the help!

[bootlegcoal]

Ok, my problem is created by .prose or by a combo of .prose and flexbox. Fixed it by adding:

1. article-content {max-width: 75ch;} and header#single_header {max-width: 80ch;} to /assets/css/custom.css
2. mx-auto class to the div on line 78 of single.html, of course copied over from the theme files to /layouts/_default/single.html

This was so few characters and such a deep dive to discern them. Not sure if/how this should be reflected in the theme itself.