I think there is some confusion here. The screenshot is not from a webform. I...

I think there is some confusion here. The screenshot is not from a webform. I don't have webform running on the site anyway. It was Drupal 8.8.5 (at the time of the screenshot). The form in the screenshot is from a views exposed filter. There are very few contrib modules on the site and only a couple custom modules, none of them having much to do with the UI.

The link I mentioned in the original issue summary won't work anymore but you can still see the same form elements at this link: https://contrib.axelerant.com. It's using the vanilla bootstrap theme right now.