Reply To: Topic page width

Check out some of the docs, there’s a link at the top of this page.

If you don’t want particular widgets in a sidebar remove those widgets, this is not a bbPress issue so we have nothing to fix here.

If you don’t want a sidebar, use a template from your theme that doesn’t include a sidebar.

http://codex.bbpress.org/step-by-step-guide-to-setting-up-a-bbpress-forum/#8-make-sure-bbpress-uses-the-page-template-we-want