Mendeley Cite allows you to change the citation style you’re using - even after you’ve finished adding all of your citations and creating your bibliography. The appearance of your citations is determined by the style you currently have selected.
To select a new style, go to the 'Citation Style' tab in the Mendeley Cite add-in window.
The 'Citation Style' tab displays a list of all the citation styles you currently have installed. When you first access Mendeley Cite with your Mendeley account, the selected style will be APA 6th edition and the tab will display the top 10 most common citation styles. You can change the style by selecting any of the displayed styles and then selecting 'Update citation style'.