Starting with version 4.0, Builder theme is responsive.
Widget Content Editor
The Widget Content feature adds the use of an advanced editor to create widget content. A new Widget Content top-level menu is now on the back-end and allows for creation of widget content with the same interface as posts and pages. Once a Widget Content entry is saved, you can add the Widget Content widget to a sidebar location and select the desired Widget Content entry from the drop down to add that content to a sidebar.
Builder provides the ability to export 'Layouts and Views' and/or 'Theme Settings' and import them to another WP site running Builder.
Note: After entering Google Analytics ID in Builder settings,
1. it might take a day or two for Google Analytics to show tracking data in your account.
2. when page source of site is viewed,
UA- number doesn't print directly in the page.
We can see code similar to
Above code loads wp-content/uploads/it-file-cache/builder-core/script.js file which is where the Builder-generated scripts are.