define( 'DISALLOW_FILE_EDIT', true ); error message visible

Hi, since installing Defender, I see this message both in the Dashboard and on the front end of the site:

define( 'DISALLOW_FILE_EDIT', true );

I've tried using the setting in Hardening to Disable the File Editor, but it just spins and never resolves. I've tried disabling Defender, but the error message still appears. Any help would be appreciated. Thanks!