When I edit Pagebuilder (latest version 6.9.1) page in the front-end (on a desktop screen), the mobile phone preview functionality is not working like it was before.
If there is an empty column in a row, the preview does not automatically hide that column, but shows an empty box between the active content.
This behavior is different from earlier versions of Pagebuilder, when the mobile preview looked exactly like the page is rendered in a phone's browser.