Help with shelves

I used to have shelves enabled on Calibre, but since a bit of a disaster with my data I have had to reinstall Calibre.

I have managed to restore the database of my book, but the "Shelves" column is missing, and I cannot remember, or find how to add it back.

Would someone be kind enough to post a link for adding the shelved column back please?

I assume now that it's missing I am going to have to go back and redo all the shelves that I did have?