Today one person asked this:
However I really want the content full width. Would it be possible to adjust the template so that the primary sidebar only started as the blog posts started?
This will be totally a custom page template. So creating a file “template_fwcblgpost.php” and add the following code. This new file will upload in your child theme folder via FTP or Cpanel/File Manager.
For Some theme need some CSS tweak. I applied following CSS in my style.css file: