Move, not copy, items between collections
This is an old discussion that has not been active in a long time. Before commenting here, you should strongly consider starting a new discussion instead. If you think the content of this discussion is still relevant, you can link to it from your new discussion.
This discussion has been closed.
that's very disturbing for beginners and can lead to a huge mess
See here : https://forums.zotero.org/discussion/57595/move-entry-to-a-different-collection-folder-not-just-copy
Just press Cmd on OS X, Shift on Windows/Linux during drag
Since this thread long predates that functionality, I'm going to close it.