There's a menu item. I believe it's File > Share > then you choose how (save to disk, email, export to photos app etc).
File > Save doesn't make sense because you would be saving your iMovie project. You're trying to export the final video from the project, not save it.
The problem was using a far too complex tool to do a simple job (and not understanding how the tool works). You can trim a video in Quicktime or Photos which directly manipulates the file.
File > Share is the same, just more user friendly language. I get it's a bit confusing if you've been using computers for a long time (it's certainly caught me out), but 'Share' makes much more sense. Especially because export/save to disk is only one of the multiple 'Share' options available.
Yes! It makes total sense to share with myself a Pages document as PDF! I‘ll promptly think of sharing if all I want to do is save/export a file in a different format. I think we can extend that helpful language to the entire OS! No need for a “copy” or “download” button, it’s all sharing, one way or another! Share share share!
"Export" means "save this working file in one of many formats, including possibly other formats that are first-class in third-party apps but not this app"
File > Save doesn't make sense because you would be saving your iMovie project. You're trying to export the final video from the project, not save it.
The problem was using a far too complex tool to do a simple job (and not understanding how the tool works). You can trim a video in Quicktime or Photos which directly manipulates the file.