The Contact Storage module provides storage for Contact messages which are fully-fledged entities in Drupal 8.

With it you can store, edit and delete messages, customize button text, hide preview button and work with it all in Views.

The Contact Storage module adds the "List" Tab to the Contact Forms Screen as shown below.

Under the "List" Tab you can View and access all messages submitted thru Contact forms. And since this is a View the site developer has full control of the display.