This may be nothing like yours, but my last Outback a sofa like that. I used it as a better access to my water heater.
I just removed the screws that were hiding behind the buttons.
I got a piece of aluminum from HD. I cut it in half and bent each piece twice making it a hanger.
I painted them black, only because the sofa had a black frame.
I attached the brackets to the kickplate. The kickplate simply hangs on the frame now. Barely visible when the sofa is up or down.
Also added, small rubber bumpers at the bottom on the back side, at the bottom to keep it from moving around.