Exclude category on flatbase knowledge base grid.

flatbase-exclude-category.php

<?php
//* Do NOT include the opening php tag

// filter the knowledgebase parser
function nice_knowledgebase_exclude_cat( $args ){

	$args['exclude'] = '8'; // replace 8 with the id of the category you want to exclude

	return $args;
}

add_filter( 'nicethemes_knowledgebase_default_args', 'nice_knowledgebase_exclude_cat' );