Kadence Post Grid pass category as URL parameter

add_filter( 'kadence_blocks_pro_posts_grid_query_args', function( $args, $attributes ) {
    if ( isset( $attributes['className'] ) && strpos( $attributes['className'], 'projects-grid' ) !== false ) {
        if ( isset( $_GET['cat'] ) ) {  // 'cat' = your param name
            $term_slug = sanitize_text_field( $_GET['cat'] );
            $args['tax_query'] = array(
                array(
                    'taxonomy' => 'category',  // e.g., 'category' or 'project-category'
                    'field'    => 'slug',
                    'terms'    => $term_slug,
                ),
            );
        }
    }
    return $args;
}, 10, 2 );