This page: https://docs.magnolia-cms.com/product-docs/6.2/Authoring/Editing-pages.html

should be updated to describe the new functionality of "Add new component", now it can also be clicked for components and not just areas as it was previously.

In particular, here: “To paste a component/s, copy the component/s, click on an area bar and click Paste component/s. You can paste the component multiple times by repeating the procedure."