A "page" is the display on the phone's screen at a certain point in time (applications often contain several pages, and the user can navigate from one page to the other).
Starting with version 2.2.6, a Page can have the data element Exclude from Navigation Bar. If exists and is set to "Yes", the page is not included in the Navigation Bar (and the Navigation Bar appears only when there are at least two non-excluded pages).
You can freely define the content of the page, but the Page template helps you include frequently used elements:
Sample modeling (a single page app) - Gusetbook:
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