To update an existing citation in your document, click on it so that the citation is activated (gray “highlight”). You will notice it opens back up in the right panel. For citations with multiple references, an individual reference can be deleted by clicking on the corresponding X button in the right side panel, followed by the “Update Citation” button. You can also change the order by dragging the grey boxes (ie. "Miller, 2012" , "Braasch, 2016" ) in the desired order. With all changes, for them to take effect, you'll need to click "Update Citation" at the bottom of the panel.
Search in the “Bibliography” section to update with another citation style anytime. Please note that in order to change the inline styling, you need to insert bibliography.