A flattened list isn't possible since it contains shows and movies, plus this feature is more for large libraries anyways.
These do list all of the content. When visiting More, nothing is truncated. When Channels presents your content this way, it's never truncated, it's just sorted specifically.
I'll give an overview of the rows for Kids and how they're sorted, which are designed specifically for how kids watch stuff.
- Favorites - Movies marked as favorite
- Recently Watched - Kid movies that have been recently played (doesn't have to be completely watched)
- Recently Added - Kid movies that have been recently added, so they can find their new stuff fast.
- Kids Shows - Kid shows ordered by the last time they watched an episode. This forces the stuff they've been watching up to the top to get to them faster.