Hi David,
Thanks for reaching out with your question about BoldGrid Post and Page Builder for WordPress!
I tried inspecting your site but it seems to be producing an error, maybe the URL was entered incorrectly by mistake but no worries.
You can take advantage of the responsive utilities inside of Post and Page Builder to control the way elements appear on different screen sizes.
By default all elements are visible on all device screen sizes. But you can create a unique mobile experience by hiding elements that are better positioned to display on larger screens using the responsive utilities.
I hope this helps! Please let us know if you have any other questions for us.