Navigate to your Setup > Main page of your project. Scroll till you reach your Output Settings section. Beside the Company Cover Pages you will have a drop down that will allow you to select any Cover Page Templates that are available for your use. Find the one you want and select. Remember to click Save!
If you with to modify the cover page preferences based on each Doc Code, click here to read the article Cover page and Stamp preference for each doc code.
For more information on working with Templates please check out our video: Templates