Filter Posts By Category https://wp.me/p1lTu0-gQm

functions.php

genesis_register_sidebar( array(
    'id' => 'facet-categories',
    'name' => __( 'Filter Categories', 'genesis' ),
    'description' =>  __( 'Filter Posts by Categories.', 'genesis' ),
) );

add_action( 'genesis_before_sidebar_widget_area', 'facet_categories_widget' );
function facet_categories_widget() {

if ( is_home() || is_front_page() || genesis_is_blog_template() || is_archive() || is_search() ) {

genesis_widget_area( 'facet-categories', array(
	'before' => '<div class="facet-categories widget-area">',
	'after'  => '</div>',
	));
    }    
}

add_filter( 'genesis_attr_content', 'add_facetwp_template_class' );

// Add custom attributes for facetwp-template class to genesis main content element.

function add_facetwp_template_class( $attributes ) {
    if ( is_home() || is_front_page() || genesis_is_blog_template() || is_archive() || is_search() ) {
        $attributes['class'] .= ' facetwp-template';
    }

    return $attributes;

}