Display only parent categories in Taxonomy Badge

parent-categories.txt

Add the following code in active child theme's functions.php

add_filter( 'uael_posts_tax_filter', function( $terms ) {
	$parent_terms = array();
	$terms = wp_get_post_terms( get_the_ID(), 'category' );

	foreach( $terms as $term ){
		if( $term->parent == 0 ){
			array_push( $parent_terms, $term );
		}
	}
	
	return $parent_terms;	
}, 10, 2 );