Feature: Filter by main category only

[klemens-st]

Add a shortcode parameter that would change how the plugin queries posts so that posts are only returned if their main category matches the specified one.

Example: [catlist id=2] returns all posts with category ID 2 even if it is a secondary category. Add something like main_cat_only=yes to allow customisation of this behaviour.

https://wordpress.org/support/topic/list-only-posts-from-primary-category/