Taxonomy Layout Injector allows you to edit the layout of the Category, Tag and any other registered taxonomy including those registered by nearly any other plugin, In addition it will change the layout of the Author pages.
Divi/Extra, by default, do not allow any configuration at all on taxonomy archive/author pages. You are given a list of items and a fixed sidebar with no styling or layout capability. You can use a child theme but then you have to code and even then it can take a long time to achieve the desired result.
This plugin allows you to create a layout using the Divi library in any column/row format and using any modules you see fit. Add a couple of new modules created for this plugin and use their settings to make your taxonomy archive pages and author pages really stand out. In short this plugin adds a number of custom modules to the Divi Builder and a settings page to link the two together. You have the freedom of the Divi Page Builder which we all know and love to construct a layout to suit your needs.