The white category bar and its dropdowns now tend themselves: a category with nothing in stock behind it (counting all its sub-groups) steps out of the menu automatically, and walks back in within minutes of you restocking. So a missing category is a message: check its items’ stock status.
You control the order of the bar and each dropdown separately from the homepage tiles – the two never fight. And the “Hide from the menu bar” checkbox on a category now hides it from the dropdowns too, while its page and homepage tile keep working.