We currently don’t have the option to privatize single individuals for trees that were originally created online, or for GEDCOM trees.
You can privatize a single individual in a tree that you created in Family Tree Builder software and synced with your online family site.
To do so, please go back into your project in Family Tree Builder, and go into the person that you would like to privatize. Click on ‘Edit’ to edit their details. Go into the ‘More’ tab and make sure to check the option ‘This person is private’ (as in the picture below).
Sync your tree with your site. You should now see that individual as ‘Unknown’ on our site.