The reason why Douyin's local mode became a large-screen viewing mode is that Douyin has made improvements to the local mode in order to improve the user experience. Watching videos on a large screen can improve the user's viewing experience and make it more comfortable. At the same time, the interactive functions on the large screen are also richer, and users can interact with other users more conveniently. In addition, the operation of the large screen is simpler, and users can more easily discover and follow the content and users they are interested in. In short, the local mode of Douyin has become a large-screen viewing mode in order to improve the user experience and better meet the needs and expectations of users.