Slide the opening pick along the screw cover to slice the adhesive.

Use a pair of tweezers or your fingers to remove the screw cover.

You might want to replace the screw cover adhesive during reassembly. Apply a bit of high-concentration isopropyl alcohol (>90%) to a Q-tip or use a cleaning pad to gently remove the leftover adhesive on the rear cover of the controller before installing new adhesive.