First of all open your CD and find the design you would like to use.
In the CD I have used, Floral Fantasia, the design sheets make up an A5 card. If you would like to make something smaller, you need to go to your printing page.
This is mine.
You will see in the white box, the printing area. It is now showing the 50% printing area.
I have also gone into Properties and changed the paper to Matt Photo paper, which is what I use for CD printing.
These are the sheets printed in 50% and 100%.
I hope this helps you, to get more out of your CDs.
See you soon,