How to Completely Remove and Reset Polylang in WordPress

A failed attempt

I tried Polylang for multilingual posts, but some settings could not be changed after initial setup. Deactivating, deleting, and reinstalling the plugin kept the old configuration, so I needed a complete reset.

One tutorial suggested renaming or deleting WordPress's language folder before reinstalling Polylang. It did not work for me and is a risky way to solve a plugin-specific problem.

The official method

The procedure in Polylang's official uninstall guide worked:

1. Keep Polylang active for now.
2. In wp-config.php, add the following line before /* That's all, stop editing! Happy publishing. */:

define( 'PLL_REMOVE_ALL_DATA', true );

3. Save the file and refresh the site.
4. Open the plugin manager, then deactivate and delete Polylang. Reinstalling it will now start the initial setup again.