As mentioned above, the root of the existence of evil in the sense of actual evil lies in the lowest level of Malchut of Asiyah. Thus when the Supreme Mind wanted to produce evil, this was done by hiding Atzilut from the garments. They then ruled independently, and the concealment intensified to the point where that lowly power emerged and evil came forth – actual evil. And when the unity is once again revealed and asserts itself to rectify the damage, the state in which evil actively produces evil has to be negated.
Accordingly, the particular power that produced it in actuality no longer needs to exist, and the concealment that brought it forth disappears. Rather, the garments exist in the same way as they did in the beginning, where evil has the potential to be actual evil, except that it does not come forth because of the unity that has returned and consumed it, and which no longer allows it to exist in the state of actual evil.
This necessarily shows the functioning of the unity. (The unity is revealed only after the emergence of actual evil. Evil has the power to spread, and is prevented only through the revelation of the unity. Thus evil continues to exist in its sunken state in order to show the power of the unity.)