This seems like a simple enough thing to do, but I've been trying for a bit and can't seem to find out how to do it. Basically I already have a bunch of collections, and I simply want to move one of them into another. For example, if I have the collections:
I want to move "Apples" into "Fruits," like so:
But I can't seem to figure out how to do this. Drag and drop doesn't work; and nothing in the right-click menu or the (seemingly useless) "Organize" menu hints at how to do this.
Note: I do not want to create a new collection inside of an existing one. I want to move an already-created collection into another existing one.