Be it Page Builder or any editor, Undo and Redo are important feature and as planned we are glad to implement them in the latest release od JA Joomla Page Builder. Taking it further the Page Builder now also supports export and import of pages, now that should make designing landing pages a breeze. More blocks and more settings also made it to this version. Thanks a ton for the feedback and feature requests, its shaping the Page Builder in the right direction. Try out the new version and let us know what more you want us to work on.