The power button is what I call "hard" allow all, i.e. it turns off completely matrix filtering. The "all" cell (top left corner of the matrix) is a "soft" all

The power button is what I call "hard" allow all, i.e. it turns off completely matrix filtering. The "all" cell (top left corner of the matrix) is a "soft" allow all, i.e. it allows everything except those hostnames and types of request which are not specifically blacklisted.