Parent page

https://helpx.adobe.com/indesign/using/master-pages.

A parent page (previously known as Master page) is like a background that you can quickly apply to many pages. Objects on a parent page appear on all pages applied. Parent page items that appear on document pages are surrounded by a dotted border. Changes you make to a parent page are automatically applied to associated pages that commonly contain repeating logos, page numbers, headers, and footers. They can also contain empty text or graphic frames that serve as placeholders on document pages. A parent item cannot be selected on a document page unless overridden.

The good question is, when this update will appear with application... changing master page to parent page??

my cuurnet indesign version is 16.4   2021