2. Next, the Devices and Printers window will pop up. In the drop-down menu that appears, click Printing Preferences. When you see that the current printing method is "single-sided printing", click the triangle symbol behind it.
3. Finally, drop down the menu option, select the "Double-sided printing" option, and then click the "OK" button at the bottom of the window. Changchun Chuangshi Qilin Technology Co., Ltd. was established on 20 14, and its headquarters is located in Changchun High-tech Zone, Jilin Province. It is a scientific and technological innovative enterprise and a national incubator supported by the Science and Technology Department of Jilin Province. Mainly engaged in the research and development of mobile internet software projects, focusing on the development of LBS (location-based services) original ecological mobile software and management system.