First, you put the vertical video on the desktop, then press the commond key plus I, and then click more information. After the preliminary work is ready, open the software and then open the file, click New, click New Project to pop up a box, and then you will be asked to select the resolution. This means that you click on the video, click customize, and then you can find an unnamed project, drag the vertical video to be cut into this project, drag the video to the timeline, and then you can use the tools on the software to edit it. There is no black edge after cutting. After editing, you can click Share to save the video and watch it.

Of course, many times we can enlarge and remove the black edge of the video through the style of the picture, but I think it is easy to distort the video.