Why is my book showing in Google book search when I didn't opt to enable it?
If your book is in genaral access, it will always be returned in Google search.
It should not, however, be listed for sale in the Google Bookstore.
Here is some additional information about the Google Book Search feature: Google Books FAQ
Many thanks for the explanation - makes sense now. It isn't listed for sale on Google books, but there is a link to Amazon - fine. Googleplay has the ebook for sale - also fine.