Yep, Scalf77 is correct. That panel is only removable AFTER you get the fridge out of its cabinet. You are not helping yourself to remove the fridge by trying to get that panel off.
There are four screws, two on each vertical flange on the front left/right. There are likely additional screws coming in from the sides under plastic caps like Scalf77's shows. and Twoxentrix mentions. SMB used long screws coming in from both sides further back.
Look for and remove all those screws and the fridge will slide out. If it does not slide out, then there is another screw still in there someplace.