Query String Filter

Hey Folks,
I’ve been trying to avoid reaching out but I’m getting myself turned around.

I have a Single Layout with a looper. The general idea is that when I select a Designer (link on another page with designer name passed in the URL), I should land on this page and see all of the home designs they’ve created.

Here’s the page: https://vermontframstg.wpenginepowered.com/designer/classic-timberworks-designs/

This layout for it is called Designers Layout.

The current Query String is: post_type=timber_frame_design&posts_per_page=25

I can’t seem to find the right combination to get the filter to work. In this case the page should only show the designs where designer_name is Classic Timberworks Designs