When editing the article withe page builder you will see the normal page builder - full screen view.
You MUST remember to close the pagebuilder/YOOtheme customizer if you want to view the impace of your changes on another tab. If you don't do this you will continue to see the original behaviour of the pagebuilder. This is because of the way that YOOtheme uses cookies to keep track of an active builder/customizer session.