How does reading Anne's diary affect Mr. Frank's decision about remaining in Amsterdam?

Reading Anne's diary helps Mr. Frank better understand his daughter's experience during their time in hiding. It gives him insights into her thoughts, feelings, and struggles, which ultimately influences his decision to publish her diary and share her story with the world. This act of remembrance and honoring Anne's memory becomes a driving force for Mr. Frank to remain connected to Amsterdam and ensure that her voice is heard.