Note the Order By > Random parameter is a GB Pro feature.
Order is in free. Order By is only in GenerateBlocks Pro.
If you don’t have GB Pro then:
1. Add this PHP Snippet to your site:
add_filter( 'generateblocks_query_loop_args', function( $query_args, $attributes ) {
if ( ! empty( $attributes['className'] ) && strpos( $attributes['className'], 'orderby-rand' ) !== false ) {
$query_args['orderby'] = 'rand';
}
return $query_args;
}, 10, 2 );
2. Edit the Query Loop, select its Grid Block and in Advanced > Additional CSS Class(es) add: orderby-rand
And that will set the WP Query orderby=>rand
parameter.