Related posts with category

related-posts.txt

1) Choose Custom Query from the Query Type - https://cl.ly/416e1b805c93.

Please paste the below code in your active child theme's functions.php --

add_filter( 'uael_posts_query_args', function( $query, $settings ) {
	
    $post_id = get_the_ID();
    $cat_ids = array();
    $categories = get_the_category( $post_id );

    if( ! empty( $categories ) && ! is_wp_error( $categories ) ):
  
        foreach ( $categories as $category ):
            array_push( $cat_ids, $category->term_id );
        endforeach;
    endif;

    $query['category__in'] = $cat_ids;
    $query['post_not_in'] = array($post_id);

    return $query;
}, 10, 2 );

This will show the related posts with category.