If you’re using a page template to show testimonials then there is not automatic filtering of categories. In order to provide a select field or some other mechanism on this page you would need to build the page to filter by some type of url query string value. See the “Dynamic $_GET parameters” section of this page https://www.advancedcustomfields.com/resources/query-posts-custom-fields/ Without doing this there is nothing passed to your page template that will let you filter the posts.
If you use a custom taxonomy, for example let’s say you name it “testimonial-category” and you create a template for this taxonomy as I mentioned then WP will use this template files and automatically filter the testimonials for you and you simply need to link to that page. For example http://yoursite.com/tesimonial-category/doors/. This template file would work the same as the standard archives.php, category.php or tag.php file.
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