The Layout tab gives you 9 preset options to create Rows and Columns for your layout. You can also create your own row/column by typing numbers into the Create your own textbox. Page Builder uses a 12-column responsive grid that uses a CSS file to automatically calculate the width of each module, across different device sizes. This feature saves designers a ton of time, because they don't need to mess with styling the widths.
Add Page Builder Widgets to your page. Be sure to check out Page Builder Extras to implement pre-released widgets.
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