Changing the design after you have paid

A drawn design is bought as itself, and that is true of All-in too: the bundle covers one design along with every add-on, not the whole collection. Picking another drawn design is another purchase.

You can open any other design and try it on the event. It stays locked until it is unlocked, and the design you paid for is always there to go back to. Nothing you have written is lost either way.