Hey, Patty!
Everything that is under "Manufacturers" + designer name, is only what that designer did + outside collabs (like
here, my own store).
If you go to "Shop by DESIGNER" + designer name, you can see all her products + outside collabs + inside collabs (
here, my own full store).
Using the advanced search also can help... again, using myself as sample:
I hope this helps!
The advanced search really helps when you discover all subcategories on it and etc.