I have a folder (=chapter) with a bunch of text documents (=scenes).
(BTW it is a collection of old documents imported for various sources which have not been carefully split and I need to arrange and edit them)
For the nature of the job I need to see the whole chapter in the screening window, so it is no good to click on the single binder text documents.
So I locked in place the chapter and it worked like a charm: the binder worked as a navigation aid.
…and I thought that the locking was useful only for split screen situations.