There are two lists that you can generate that will show you all of the Condition Tags used in a book (and where they are in play).
1. From your book file, Add > List of > References... and select Condition Tags. This will provide a listing in order of occurrence throughout the book.
2. From your book, Add > Index of > References... and select Condition Tags. This will provide a more succinct listing of the individual Condition Tags in alphabetic order, i.e. an Index. [This is probably what you want.]