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What theme are you using? At a basic level, this is a theme-level issue, because the structure of your page templates (two-column vs one-column) is, at root, a question of what’s made available in your theme.

> remove the sidebar widget area from only the pages after the member subfolder (not all member pages, because I still need a widget for the members page.

If I understand correctly, you mean that example.com/members/ *should* have a sidebar, and example.com/members/* (any page under /members/) should *not*. If so, you’ll need to include some special BP-specific logic, because from WP’s point of view all pages under /members/ are “the same page”. But the details of how this will be done depend on the kind of theme you’re using.

Thanks for the additional details.

I don’t have access to the Vertex theme, so it’s hard to give precise instructions. But what you’ll need to do first is to identify whether the theme comes with a full-width (or one-column) page template. I’m guessing that it does. (You can test by creating a test page, then selecting the various Template options from the dropdown under Page Attributes when editing the page. Cycle through them, save the page, and view it on the front end until you find one that displays the page content without the sidebar.)

Then you’ll need to identify the theme file that is powering this template. The geeky way to do this is by looking at the source code of the Templates dropdown (page_template) and get the value of the option you’ve located. Then find this file in your theme directory wp-content/themes/vortex.

Then: assuming you’re using a child theme of Vortex, create a directory wp-content/themes/vortex/members/single/. Copy the template you found to wp-content/themes/vortex/members/index-directory.php. That should be all you need to do.

If you’re not using a child theme of vortex, this change will be overwritten next time you update the theme. In that case, the following filter should be an all-purpose solution. “full-width-template.php” should be replaced with the name of the template.

function bbg_vortex_member_directory_templates( $templates ) {
    $my_template = WP_CONTENT_DIR . '/themes/vortex/full-width-template.php';
    return array_merge( array( $my_template ), $templates );
}
add_filter( 'bp_template_hierarchy_members_directory', 'bbg_vortex_member_directory_templates' );