A family of Microsoft word processing software products for creating web, email, and print documents.
I do not use that feature so will be of little help in restoring it.
I do have Word on my Taskbar and so will see open documents on hover.
However, simply opening Word, recent documents appear in Backstage when I click on the File button.
Also, File > Open gives access to the Recent files (and folders).
You may find those methods even better.
I generally have Word active when using my computer.