This article with walk you through uninstalling the Beta. https://us.community.samsung.com/t5/Galaxy-S10/One-UI-2-0-Android-10-Mega-Thread/m-p/880136#M41451
I believe the Beta is now closed for the S10 family of phones in the Beta. The Beta for Note10 is expected to be released soon. If you are not already in the Beta and do not have a Note10 phone, you will need to wait until the official release of the operating system.
After upgrading to beta, my Bixby button no longer does anything. I did the initial Bixby setup, disabled remapper, and also tried wiping cache in recovery. With remapper on, also get no response.
Good afternoon! I've seen a post from @Charkatak that you might find useful for reporting this issue:
"Please report beta issues properly. Look under "reporting bugs":