"On" since it's the only way to make adjustments
Sharp's menu design is confusing. You have to adjust BOTH 2 and 10-point settings. To adjust the 2-point setting you have to turn the "10 point settings" setting Off; afterward, turn it On to adjust the ten points (using the Position slider as you seem to have discovered). The actual "On/Off" position of the "10 point settings" switch has no impact on the picture itself.
Note: This post was edited by its original author to tweak explanation on 12/12/2011 at 6:05 AM PT
Note: This post was edited by its original author correct a typo on 12/12/2011 at 7:10 AM PT