I'll bring this up once more, as a previous attempt didn't get a reply, so I'm unsure if this is intentional or not.
When enabling the album collapse/expand feature for Album&Tracks view, the sub-headings dissappear. This is especially unfortunate when viewing audiobooks, which often contain 50+ tracks. Usually audiobooks are divided into multiple discs, which are nice to have displayed as a sub-heading. Having them all expanded requires a lot of scrolling.