Answer:
This change humanizes the monster and gives us a vision of how the monster feels and thinks about everything that is happening.
Step-by-step explanation:
While reading "Frankenstein" we are presented the story from the point of view of Victor Frankenstein, who sees the monster as a cruel and terrible creature, which causes pain and suffering wherever it goes, in the name of selfishness, evil and insanity you have. Thus, when we see the monster from the perspective of Victos, we see the monster as something cruel and without feelings.
However, when the narration changes to the monster's point of view, we can understand his longings, feelings and elements of his personality to act the way he does. In this way, we have a humanistic view of the monster and we can and understand the complexity and depth of the character.