Because the ratio has changed. There are two kinds of vibrato video: horizontal version and vertical version, so if you want vertical version of video, the first step is to create a vertical screen with horizontal screen resolution Tik Tok and change it to horizontal screen. So you see, it is also horizontal. You didn't change the clip to vertical screen. In fact, it is to convert the vertical video of 9: 16 into the horizontal video of 16: 9. Horizontal means that you have already reset it in it, so we must first create a horizontal screen resolution of 16: 9.