This solution assumes that you have already downloaded the correct xerox driver for your printer. If you have not already done so, visit to search and download the proper driver.

Once you have the Xerox printer driver installed, open any window or document you would like to print. At the top of the window navigate to "File" and then "Print". In the print window under look under the options "Paper Size" or "Orientation", there should be a dropdown box that may be defaulted to "layout". No matter what, click this dropdown and look for the option "xerox features". Within the "xerox features" you will be able to choose 2-sided or 1-sided printing. 

See screenshots below.