Just uncheck them, if they are unchecked it is disabled. Not sure why you think when there they are checked and state it is allowed, unchecking them wouldn’t work.
Because of what the text behind it says that the default is enabled.
But I get what your saying is that by default the checkbox is checked.
The reason why it confused me, might be because I’ve unchecked the checkbox for new user registrations, but the button is still available on the login page and it’s also clickable.
Just tested the registration. It fails on submission because it’s disabled.
Would be nice to get a message or something before you’re even able to fill in the information.