Import my libraries

I had to reinstall my Windows 10 Pro OS and I kept all of my old data. However, when I reinstalled Calibre it won't import all of my old libraries, and I have a lot of them. I have all of the books in the main Calibre LIbrary but then I have all of the individual authors in their own library so I can easily switch working with one author to another:




How can I make Calibre recognize all of my libraries?