A/V sync settings in Openelec?

Going thru the wiki I saw an a/v sync setting with three options. However, it’s not in my video settings where it should be. I know I can manually offset the audio forward and backwards, but I was liking the idea of an automatic version. No one on the openelec forum has deigned to reply so I thought I’d try here. I am referring to a/v sync method, under PLayback here: http://kodi.wiki/view/Settings/Videos

Running OE 8.0.4, Kodi Krypton 17.3 on a raspi3 if that helps.