Using Collections for editing: tips
To clarify — when you create a Collection, you don’t change documents in your Draft folder, other than the document you’ve editing itself. You can delete a Collection, and it doesn’t affect your Draft documents at all. You can move documents in a Collection around, without disturbing your documents in your Draft folder. However, when you edit a document in a Collection, your changes appear in the document in your Draft folder.
You can create as many Collections as you like. Occasionally I save a search as a Collection, but mainly I create Collections whenever I think they’ll be useful, either when I’m working on the first draft, or later, when I’m editing the novel.