Content automatically flows from one column to the next, creating new pages as content exceeds the available space. You can navigate between pages by clicking the page numbers below the menu preview.
Manually Adding a Page
First add the section you would like to appear at the top of the next page in the Text tab. Scroll to the bottom of Menu Sections list, click +Section button that is located about the Page Footers area, and enter a section name.
To move the section to a new page, click the Format tab at the top of your screen. Select your new section on the menu preview, then click Insert Break as shown below.
This function will also work when wanting to move a section from one column to the next. For further information on using Page Breaks, check out the article listed here.