There are 3 more clips underneath. Release these.

The side panel is still held by a clip underneath where the control panel was. Press it from under the printer with a flat screwdriver. Ease this section of the side panel forwards, making sure it bends at the front corner, not by the clip, where it is relatively weak.

(In the photo you can see the arrows I marked to remind me where to bend it and where not to.)

On reassembly, locate this latter clip before offering up the others.