The 'Re-add text underline and justify' plugin is a small yet effective tool designed for WordPress users who prefer the traditional editing features of the Classic Editor. This plugin reinstates the underline and justify buttons that were removed in WordPress 4.7, allowing users to edit content with the familiar functionality they had in earlier versions. It is lightweight and compatible with both the Classic Editor plugin and Gutenberg's 'Classic' block, ensuring a seamless editing experience.

Users have the option to customize their editor style through the Writing option page, choosing from three settings: no underline and justify buttons, default (with both buttons restored), or just the justify button. The plugin is particularly beneficial for those who wish to maintain consistency in their editing interface and avoid confusion for their customers. Note that a previous option has been deprecated to prevent conflicts with the Gutenberg editor.