Figured it out.
Within your child theme, copy over all the files from within wp-content/plugins/buddypress/bp-themes/bp-default/
These should have already been copied over if you have been customizing buddypress at all on your site.
The file you want to edit to make buddypress docs full width is not in the buddypress docs plugin, but rather in your child theme now, specifically the wp-content/themes/your-child-theme/groups/single/plugins.php file. This file specifically gives directions to plugins that interface with buddypress groups — it tells them how to render the page.
Get rid of the following line <?php get_sidebar( 'buddypress' ) ?> found at the bottom of the document. To work with my theme, I also had to change
<div id="content"> to <div id="post-content"> found at the top of the page.
Now, that usually does it. But not with buddypress docs. There’s one more change I needed that eluded me for awhile (the reason I initially posted), and I still don’t like the solution required, but here it is:
You have to change your page.php theme file, as buddypress docs appears to be using it to render the “create doc” page. So move it from your main theme folder to your child theme folder. Once I edited that page to get rid of the side bar and comments option, buddypress docs was full width throughout the user experience.
