Hello ,
Thank you for posting your question in the community about sorting the user library based on name, typically it should organize them by Alphabetic order (Folders first than individual elements), and it is possible you need to close and reopen Twinmotion for certain elements to sort correctly. If there are some issues on your end with how it sorts we should look further into this as there could be a bug and you can report it by following this link: https://twinmotionhelp.epicgames.com/s/case-community-page
Kind regards,
Vincent B.