This can help you in deciding which output style to use or if you wish to find an existing style to modify to suit your needs. It allows you to pick an output style and view the format for the Bibliography and the in-text citation.
It is available from the Bibliography menu option under Preview Output Style.
You can then select an output syle in which to view references.
You can choose to view a selection from your own account or a default sample set - but note if you select your own references only the reference types in your database will be displayed, i.e. if you don't have any Conference Proceedings in your list of references, you won't see a preview of Conference Proceedings. You may also see stray punctuation or bad data- which is probably due to incomplete or missing data.