Oversized Padding at Mobile Widths

I have a question about this:

$submission_info = \Drupal::config($config_file)->get('settings.node.submitted');

Seems there are no property 'settings.node.submitted'. I've found only property "display_submitted".
Why does it need? Right now 'settings.node.submitted' is always empty and it's the reason of issue with big padding in mobile version.

Note: This was originally reported by @eugene.ilyin at https://www.drupal.org/node/2662854#comment-10853992.