Safety filter pixelates instead of erasing on cleaning tool

The cleaning tool, when I try to erase a face, a part of a body, or even an object, doesn’t actually remove it, instead, it pixelates it. At the bottom of the screen, a message appears saying “Safety filter applied.” This message then disappears after a few seconds.

How do we do to remove it ???

[Re-Titled by Moderator]

Original Title: Safety filter