I hadn't opted out, I don't know how I missed the message about opting out but today all of our lists/libraries have switched over to modern.
I can no longer switch it back to classic in the admin center, and having to do it at the individual list/library level is going to be killer.
Is there any way that I can set all lists/libraries back to the classic experience using powershell?
I've been searching and looking but have found nothing. I found this article on here, but from the comments it looks like this does not work?