Can't get back to home screen – ShapeBuilder Preschool Puzzles Review

I bought this for my autistic 3 yr old and went to try it out. When it first opened it offered all shapes or specific category, I chose all and after seeing words/shapes like mandolin ....I decided he would do better starting with a food category only. Well, it won't go back to the home screen! It is stuck in this mode. Please fix this and think about adding the option of deleting odd shapes or cards.
Review by Valerie1461 on ShapeBuilder Preschool Puzzles.