Different slug for Q&A not working

I added the following code

/** Make the q&a plugin root the wordpress root */
define('QA_SLUG_ROOT', '');

To wp-config.php, saved it and even updated the permalinks settings on the site in hopes it would refresh the redirects, but it's not doing anything.

I am trying to set up the wordpress root as the slug for the Q&A. So mysite.com/ would load the Q&A.

I also tried

/** Make the q&a plugin root the wordpress root */
define('QA_SLUG_ROOT', '/');