How to save changes in a style in Visual CSL editor?

I have been having a problem with referencing with Harvard style, which will replace all but the first author with "et al." (I need to list all authors in the References). I found a very useful comment guiding me through the Visual CSL Editor how to do it, i.e. changing the et-al-use-first to the highest number. However, I cannot find a way to save this new setting. There is no "save" button or anything. Each time I close the window or even click on a different tab, it changes back to default and I cannot use my new setting. Is this a bug or is there a trick to do it that I just cannot see? Thanks