Welcome to the Candy Crush Saga Community
Do you have a question or need help with your game? Ask the Community.
Hi @jillyjolly ans welcome to our Community!
The Dexter Space League and what planet you are on is based on how well you managed to reach the target you have on the planet.
You will move back to the previous planet only if you don't hit the targets and move forward if you payed well, but there is no way to reset the League and start from the beginning.