Netflix-Codes.com has a good list of the streaming platform's hidden genre categories and subcategories. In total, there are ...

Netflix on the Apple TV app is a feature that ... Recently viewed videos also appear on the Continue Watching shelf on the Apple TV home screen, with their latest playback states synced.

If the extension is installed, you'll see a Browse All option at the top of your Netflix home screen next to My List. Click it to scroll through the subgenres or to search through specific categories.