3. Edit Your Transitions
When making a new movie, you have the option to use any of the pre-made iMovie transitions. But if you want to get a little fancy and customize your transitions, you can. It just takes a few more steps.
- Open the Transitions menu by pressing Command + 4 (or clicking the Transitions button on the far right of the middle pane.
- Choose the transition you would like to use and drag it to the desired location on your timeline.
- Double click the transition to open the Inspector menu. Here you can input how long or short you want the transition to be.