Google Docs has introduced a new feature called document tabs, which allows users to organize and navigate their documents more effectively. This feature is particularly useful for writers who create longer, more complex documents such as books, research papers, or proposals. With document tabs, users can click on a heading in the left sidebar and be taken automatically to that section of the document. The feature also includes handy tools like renaming, duplicating, and moving tabs.

Source: https://www.zdnet.com/home-and-office/work-life/im-a-google-docs-power-user-and-this-new-feature-is-genuinely-helpful-heres-why/#ftag=RSSbaffb68