To me the usability of the main menu is flawed. There is no visual clue to indicate, that there are more than 5 entries in a specific category. Once you have learned, that these categories are scrollable the entries are fairly simple to access, but new users have little indication, where and how to look for them.
In the screenshot below, we have 7 collection types and 5 single types. It’s looks like the same amount.
