So after speaking with an agent, its known that one cannot rollback or reset once this specific preview has been installed. The only solution to rollback is to clean install Windows 10 from a USB flash drive. I think I'll do that, sell my laptop and get a MacBook.
Whatever makes you happy. 😉
I never use rollback.
I save Windows Image Backups in case I want to go back to a working system.
I only keep the system on a 512GB SSD, all my data is on separate HDDs.
It is quick to make a System Image Backup and restore it when needed.
Why do you even install a Beta build if you are not willing to see bugs ?