Restart from the beginning on adventure mode for Plant and Zombie

Hello, i'm new to the forum.

I wonder how to restart to episode 1 of the plant and zombie solo adventure. I'm stock on episode 40 on level 5/5 and I'm bored. For those who don't know about that. The developers add 40 episode and after you complete all of these and when you complete the last level on the last episode. Nothing happened. No reward, no cinematic or something. Just nothing, the game bring you back to the main menu and nothing else happened.

P.S. I have a bad English...