I have accounts in several SE network sites. The first one was on StackOverflow. I bothered to update the "About Me" box in SO and Photo.SE. In some of the other sites, and specifically in the global SE profile, the "About Me" description is synced with the SO one.
How can I unsync (leave empty) the global box, or box in any other site?
Can I select which of the populated site boxes to sync with, in a site where I do not explicitly edit the box?