Lock the URL Slug of Published Posts
Prevents authors and editors from changing the slug of a post or page once it is published, so shared links and search rankings do not break. Administrators can still change it.
Snippet Library
Admin snippets for WordPress
Snippets that tidy up and tailor the WordPress admin: hide menu items, add columns to post lists, change the footer text and remove clutter. Made for agencies and site owners who hand a dashboard over to clients or editors.