[Mailman-Users] archives 'private' by default?

[Stephen Ervin]

Dear Mailpeople;

I note (having been embarrassed by a list-archive being found & 
'published' by Google),
that  the default setting for list archives appears to be 'public', 
rather than 'private'.
(Adding one more step to the list setup process, to change to 
'private'.)

Is there a variable somewhere in mm_cfg.py to control the _default_ 
setting?
Or some other mechanism?

Thanks

SErvin