AFTER changing the default you need to press "Reset All" button in the Analysis / Parameters window if you want default to be used AGAIN, i.e. param value re-initialized using the (new) default. Default is just INITIAL value used to initialize parameter value when it does not exist.
The video below shows that if you do NOT press "Reset all" it will use OLD value. But if you subsequently press "Reset all" it will use NEW value on next execution of course.
