Citation of multiple authors

When selecting a reference with multiple authors for insertion in a document, using Harvard, the citation appears in the 'Selected Items' list in the form [first author] et al. [date]. However sometimes after being imported such citations show all authors' names, adding to the word count of the document. I know that the citation of all authors' names is not 'wrong', but I would like to know if there is a setting that ensures all such instances default to the form [first author] et al. [date]?
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