Monitor Resolution Settings

[kingdex]

I recall Jeff & Michael referring to a setting somewhere in Lightroom that is a resolution setting which is selectable for either a Retina display or any non-retina display. I can't seem to find that preference and I have no idea what video tutorial mentioned it. Can anyone point this setting out to me?
Many Thanks, Kingdex

[jarnoh]

OS X does have a per application setting to force lower resolution, you can toggle it in Finder by highlighting Adobe Lightroom.app and selecting File -> Get Info.