Short version:
Coming to Office on Windows: Recommended for you allows you to keep track of work around you and choose files with activity that matters most to you. On the home page in PowerPoint, Excel and Word you will see files recommended for you. Rolling out early June to mid-September late February 2022 available now..

Details:
Recommended files in Office has been available on Office.com and Office for Mac and is now coming to Office on Windows.

Microsoft Office will display a list of recommended files on the File tab, or start page, of Word, Excel, or PowerPoint on Windows. This list allows you to keep track of work around you and quickly access files with activity you value most such as edits, mentions, comments by people you interact with.

This feature uses machine learning to predict which files you’re most likely to want to work on next and presents those as a set of cards you can choose from. Only files that you have access to in OneDrive or SharePoint are suggested.

Each card shows the name of the file and who made changes or shared it and why it was recommended like @mentions, recent edits or comments:

Availability:
Rolling out early June to mid-September late February 2022 available now.