The front bezel is still attached to the iMac by the microphone cable.

Gently lift the front bezel from its top edge off the rear case.

Once the top edge of the front bezel has cleared the rear case, rotate the front bezel toward the stand and lift it off the rear case.

Rotate the front bezel away from the rest of the device and lay it above the top edge of the iMac.

When reinstalling the front bezel, start at the lower edge and make sure it is flush with the rear case before lowering the top edge onto the iMac.