Anyone using Joomla 4?

I’m having a problem hiding modules on the phone & desktop in Joomla 4.
In Joomla 3 with Bootstrap 2.3, it was Advanced tab> Module class> hidden-phone (with one space before “hidden”)
Joomla 4 is using Bootstrap 5 and I found this article (Display property · Bootstrap v5.0) but this isn’t working either. Anyone know the secret?
Thanks!