How do I delete an iMovie library?

Hi, Mr. Bacon,

Go to your Movies folder (Go/Home/Movies) and drag the iMovie library to the trash. Be aware that you will permanently be deleting your projects and media that are stored in the library. So before deleting you should drag out any media that you want to keep that isn’t already backed up elsewhere. Also, do a File/Consolidate Project Media and then transfer to the other library any projects that you want to keep.

— Rich

Adding to my previous post: Many iMovie users have more than one library. I have one for my regular projects, one for test projects where I try out new things, and of course backup libraries. I name my main library by year and every year I close down the library at the end of the year and do a File/Consolidate Library Media. Then I save it on an external drive, backed up. Then I create a new library to work with, named for the current year. Eventually, I end up with an archive of libraries by date. When libraries get too full they can start functioning more slowly and also more chance of a crash. With additional libraries I don't have my eggs all in one basket.

It is handy, and space saving, to have external drives that are formatted Mac OS Extended (Journaled) on which to store iMovie libraries so they don't clutter your internal drive. Anyone who works a lot with videos has external drives as a matter of necessity for space reasons.

-- Rich