To pin a document:

If you work with the same document often, you can pin it for quick access.

First, go to Backstage view and click on "Open." Then, select "Recent." A list of recently edited documents will appear.

Hover over the document you want to pin and click the pushpin icon. The document will stay in the "Recent" list until you unpin it.

To unpin a document, click the pushpin icon again.