Topic title covers the basics. Is this possible?
I’m working with the “relationship” field specifically, but this could apply to others in the category.
In this specific instance, an acceptable workaround would be to pre-populate the “search” filter, but I don’t know how to do that either.
You can filter the posts by anything that you can filter posts by using WP_Qurey by altering the query for a field using this https://www.advancedcustomfields.com/resources/acf-fields-relationship-query/
And you can find an example of the query here https://wordpress.stackexchange.com/questions/29918/page-template-query-with-wp-query
These two links got me exactly where I needed to go. Thank you!