This study will look at how well CagriSema compared to Tirzepatide helps people lower their body weight. CagriSema is a new investigational medicine developed by Novo Nordisk that combines Cagrilintide and Semaglutide. CagriSema is not yet being prescribed by doctors. Participant will get injections once a week throughout the treatment period. Participant will inject the study medicine under the skin with a pen injector in the thigh, stomach, or upper arm. After a first low dose, the study medicine will be gradually increased until reaching the planned dose (2.4 mg CagriSema or 15 mg Tirzepatide). The study will last for about one and a half year for each participant.