2. Then double-click the imported video file in the project window, as shown in the figure below.

3. Then drag the video file into the timeline, as shown in the figure below.

4, and then select the timeline video, click the sequence, open the sequence settings, as shown in the figure below.

5. at this time, in the sequence settings >; Adjust the height and width in the video preview to realize full-screen video.

6. You can also export settings >; Output > in source zoom, select zoom to fill the video to fill the full screen.