Rearrange movie clips in QuickTime Player on Mac
After you split your movie into clips, you can rearrange them however you want.
In the QuickTime Player app on your Mac, open the movie that contains the clips you want to rearrange.
Choose View > Show Clips.
If you have only one clip in the movie, there’s nothing to rearrange. You need to first split the movie into clips.
Drag the clips into the order you want.
When you’ve finished, click Done.