You can use the following methods:

1. Import the music file into the music track, right-click it, select "Speed/Time Lapse" from the dialog bar → in the "Speed" option , you can adjust the ruler slider. At the two normal ends, pull it to the left to make it slow, and pull it to the right to make it fast. The slow time will be longer, and the fast time will be shorter.

2. Import the music file into the music track, left-click it, then click "Options", click "Speed/Time Lapse" from the "Properties" option of "Music and Sound", the adjustment method is the same. 1 item.

3. Import the music file into the music track, left-click it, and align the mouse with the yellow line on the left or right side. When the two-way arrow appears, hold down shift on the keyboard and pull it left or right. You can change the length and speed.

4. Import the music file into the music track, left-click it, and adjust the "Trimming Mark" under the preview window to change the duration. Click "Options", from the "Properties" option of "Music and Sound", click the time "Interval" to modify the number and also change the duration.