You can cancel through “Settings > One UI Beta Program > Deregister” menu in the “Samsung Members” app. In order to use the official software and services, be sure to re-install (rollback) the final version of the official software.
You can re-install software by using the PC version of Smart Switch. Once the software is re-installed, the device will be reset and all data that was generated during the Beta Program will be erased.All data which had been backed up before installing the beta software can be recovered, but there may be limitations in recovering data that was created after installing the beta software.
Samsung Service Center also supports re-installation of the official software.
