Hi @freddredirl!
I would recommend doing a template override to hide the category field and other fields from the Jobs listing page. Overriding the template files will give you more control over the underlying HTML structure of the Search boxes.
You can follow this guide to get started https://wpjobmanager.com/document/template-overrides/
Or you could also hide sections you don’t want to show by adding custom CSS code to your site. We have a guide to help you get started making your own customizations here:
https://wpjobmanager.com/document/adding-custom-css-for-wp-job-manager/
Thank you!