The system in iMovie is very intuitive, with a simple button to select favourites and then a drop-down menu to toggle between seeing favourite videos and all the others. If you get into the rhythm of picking favourites on import, you’ll find it easier to wade through clips when you come to making a production.
Step 1: Select and click
Select the clip or portion of one you wish to mark as a favourite and then click the Favorite button here. You can also unmark a clip at any time. Selected clips will have a green line marking them.
Step 2: Access any time
Use this menu at the bottom of the interface to see your favourite videos, or any of the rest of your library of clips. Use the directory on the left to access all the different clips and repeat the process.