The "Built-In Pages" section is where you'll find the list of pages that are more system related. These are pages that don't fall into any of the other categories of pages.
Though you will not be able to create these types of pages, you can add in additional stack items within them, like text or ads. You can access the pages to make these additions by clicking the name of any page in the list.
Admin Side:
Learn how to use the Built-In Pages section under the Menu and Pages tab of our content management system in this overview video:
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call us at 217-239-0975, or email us at support@envisionwise.com.