I accidentally put out a gpo that installed the Preview version, and now I have to back it out. I am considering using the powershell command Remove Package Name.
Does anyone know of a better automated way of doing this?
Unfortunately builds in this channel are no just KBs that can be installed via Powershell. You will need to to Settings > Update & security > Recovery > Go back to the previous version of Windows 10. If it has been more than 10 days or you have taken a new build, you will not be able to roll back. The only way to get back to a retail build is by performing a clean installation.
