See the Automatic Source Citation Pane below: The item labelled Source, containing "Miss Barclay Bruce...", appears to be the (Full) Title of the Source Record in question. I would much prefer that to be the Short Title and have this vague idea that there is/was a setting to enable that choice. But I can't find it. It actually doesn't matter much since I personally find the Source Record using the Select button and I have my source records set to show the Short Title. The Source item in the Automatic Source Citation Pane is therefore no more than confirmation - useful if I'm coming back to a previously existing prepared citation.
So - is it possible to change Source in the Automatic Source Citation Pane to show Short Title, or has it been like that since ....? (and I have this feeling someone's going to tell me it's been like that since v6