“stereo” activates or deactives stereo mode.

stereo [toggle]

toggle = on, off, crosseye, walleye, quadbuffer, sidebyside, or geowall

stereo on 
stereo off 
stereo crosseye 

“quadbuffer” is the default stereo mode if hardware stereo is available. otherwise, “crosseye” is the default.

cmd.stereo | commands