Navigate to the document library in SharePoint. If it's a preview window like the below, select "See all"

Depending on the size of the library, this may take a few minutes to synchronise

You'll see a little chain link icon next to the folder when done, to indicate the folder is connected

Microsoft

This guide provides step-by-step instructions on how to link a SharePoint library to OneDrive. By following these steps, users can easily access and synchronize their SharePoint documents in their OneDrive, making it convenient and efficient to manage and collaborate on files.

Linking a SharePoint Library to OneDrive

Creating the Link

Accessing in OneDrive