Go to Front Page -> Administration -> Privacy -> Site to change the privacy settings.
If you have trouble in one browser, try switching and see if that helps.
I succeed to change my site to Privacy site in changing the language french to english on the first page of ADMINISTRATION.
Thanks so much for letting us know about this. It is indeed an error on our side and we are currently working on fixing it.
In the meantime, please use English to make changes to your site as you mentioned.
Your help is greatly appreciated!