The way the Switch Joy-Con is now, there isn’t room for any flexibility – making it just like most controllers. You can hold it in your hands or slide it into the system itself, but that’s about it.

from https://nintendoeverything.com/nintendo-files-patent-for-hinged-joy-con/
https://nintendoeverything.com/wp-content/uploads/joy-con-patent-5.jpg