Use categories to keep related datasets in one place where they can be easily located.
Page builders can use categories on the App contents screen to organize pages — this is particularly useful if you have lots of pages in an app. For example, you might have a Sales category, and a Finance category.
Any pages without a category are listed under Uncategorized.
The menu on the left of the screen provides easy access to categories. You can drag them to reorder.

Select the chevron
to expand a category and show the pages within. You can drag a page to reorder pages in the category, or drag to move it to another category.