Documentation

I've updated the the module page and README with a bit more information:

Install and enable Top Description as you would any other contributed module. See:

https://www.drupal.org/docs/extending-drupal/installing-modules →

Once enabled, it should move the "Description" / "Help text" to the top on all fields except for radios and checkboxes (it looks strange at the top on those).

This will only work for modern (D8+) themes that support a setting like for modern (D8+) themes that support a setting like $variables['description_display'] = 'before'. Claro, Olivero, and many other themes support this.

If this module does not work, it is most-likely because the theme being used does not support that setting. You might consider contacting the theme maintainer.

The module should "just work" once it's enabled. Per above, if it doesn't, it's probably due to the theme. If the most-recent version of this module still doesn't work for you, let me know what theme you're using.