The top of the USB‑C port cover is secured with a pair of plastic arms. The bottom is secured with plastic clips.

Rotate the underside of the USB‑C port cover up and away from the controller to release the bottom clips.

Unhook the plastic arms and remove the cover.

During reassembly:

Hook the ends of the USB‑C cover's arms into their slots on either side of the Xbox button.

Rotate the cover downward until the bottom clips engage and the cover is flush with the bumpers.