Page Identifier Column

Adds an “Identifier” column to the All Posts and All Pages admin panels, and to any custom post types.
This column goes just after the Title column and shows each page’s slug, indented if necessary.

1. Upload the page-identifier-column folder to the /wp-content/plugins/ directory.
2. Activate the plugin through the ‘Plugins’ menu in WordPress

1. 

   The identifier column on a list of pages, indented for children and grandchildren.