Prevent standard User-Notification

The users of my Nextcloud 11.01 are authenticated via OC_User_IMAP. In config.php I’ve set 'allow_user_to_change_display_name' => false.
Since NC 11.0.1 they can see a notification declaring the following “Add your profile information! For example your email is needed to reset your password.”.
I do not want them to fill the e-mail address or change the username.
What can I do?

You can’t change the username. You can only change the display name which can be disabled (if you can do it despite setting this option, please report it to the bugtracker on github.com/nextcloud/server/issues).
Not sure about the mail address, if that is not possible that’s probably a point for a feature request (also the same repo).