Excluded categories still appearing in search

Hello! I recently installed this plugin on a development environment of a client’s site and I’m having issues getting a certain post category to avoid showing up in the search.

The site URL is: https://wernertkdev.wpengine.com/

In the “Ivory Search” menu, I currently have the menu search settings set to show the search icon in the secondary navigation. I’ve created a search form called “Werner Search” and have it selected.

When I go to edit this “Werner Search” form, I’ve told it to exclude any search posts with the category of “Driver Portal”, however these all still appear when searching. I even tried turning off all posts temporarily but that didn’t seem to make a difference.

Thanks so much for any help!