In this 3rd part of the series on improving the Drupal experience for Content Editors, Rod focuses on the administration theme for Drupal 9 using the Gin theme. (https://drupal.org/project/gin).
Not only does this theme look great, it offers some subtle but important changes to the interface that really help a content editor. It works with Admin Toolbar, Layout Builder, Gutenberg and more. There's even a "dark mode"!