Fine-tune your movie by changing the length of clips, changing the sequence of clips, and splitting clips.
How to edit, trim, and adjust audio clips in iMovie
Arrange clips and photos in Magic Movies in iMovie on iPhone - Apple Support
Clip Art Arrow Images – Browse 105,754 Stock Photos, Vectors, and Video, photo clip
Arrange video clips and photos in iMovie on iPad - Apple Support
iMovie User Guide for Mac - Apple Support
Trim and arrange videos and photos in iMovie - Apple Support, S Clip
Trim clips in iMovie on Mac - Apple Support
iMovie Basics
Change the background of a clip in iMovie - Apple Support
Crop clips in iMovie on Mac - Apple Support