Jonas is changed by his experiences in the community. So how is he changed and how is he changed? What does he experience?
I see your point. I am sorry that previous answers to this question have not helped you! Jonas does change throughout the book. Actually, we are not supposed to answer questions that have already been answered, but since you asked again, I will give it a try. Hopefully this will help!
After the Ceremony of Twelve, Jonas does change. He continues to change when he gets exposure to the memories. The memories allow him to see the community in a different way. First, he realizes that war is not a game. This is the first example of his distance from his friends. Asher is upset when he tries to get them to stop playing war games.
When Jonas learns about love, he lies to his parents for the first time when he asks them if they love him and the correct him for using inaccurate language. This is one of the first times he realizes that he is different from them, and no longer understands them. He also stops taking the pills for stirrings.
When Jonas sees the release of the newborn twin, his transformation is complete. He realizes that he can never be a part of a community that arbitrarily kills infants. He also decides that his people should not live this life either, and he and The Giver decide he will escape with Gabriel, risking both their lives but freeing the community from Sameness.