Yes, you can. Just switch the toggle to Back.
When you switch to Back you will see a message that says Click here to create a back design different from the front.
(Don’t click it in case you want the same design on both sides)
Once you’ve clicked it you will have two independent editors, recto and verso.
You know you have different design because you will see a small preview of both sides.
Our awesome customer care team is here for you.Contact Support