I have been trying to check out the book design cover templates on Cover Creater and keep running into the same problem. I have set my page size as 8.5"x11" but when I go to Cover Creater the size changes to 6"x9" no matter how many times that I re-enter my choice. How do I get my choice to "stick?"

Please help…

I didn't find the right solution from the Internet.
References
https://forums.createspace.com/en/community/message/464045#464045
Infographic Animation Example