You've already removed all the push clips that attached the four sidewalls to the base panel.

Set the printer on its back, with the door side up and the base panel toward you.

There are four silver HEX HEAD screws here to remove, from deep inset holes. You'll strip them if you try to use a phillips head screwdriver on them (trust me).

Note that there are also three FAKE inset screw holes that are capped with plastic at the bottom of each well. A fourth is under the front left foot. I spent way too much time figuring out there are no actual screws on this side! You get to them from inside the printer, where the screws are set into the floor plate.

So, on the left side of the interior floor plate, find the two black screws, front and back, that each attach through the floor and into one of those fake inset screw holes, then remove them.