Unable to set number of columns in code

I am using this code in function.php to set the grid layout on my news page. The single featured article works fine but there are 2 columns as opposed to 3 as required- thanks for any advice

//Change grid layout for news archive

function be_news_grid_args( $args, $query ) {
    if( is_category( 'News' )  )
		$args['teaser_columns'] = 3;
		$args['features_on_front'] = 1;

    return $args;
}

https://wordpress.org/plugins/genesis-grid-loop/