Up for position control. horizontal for draft control.
Use position control for things like a mower, or ~some~ blading work.. In position control mode, the "hytrol" lever controls the height o fthe 3pt lift.
Draft control for most ground engaging implements, like plows, etc. In draft mode, the 'hytrol' lever controls the draft on the tractor from the implement. Raise the handle for more responsive 'lift'.. In other words, with your hytrol set higher, if you encounter heavy/thick material.. or a root or rock, the lift will attempt to move up and over it. The higher the hytrol is set.. the more responsive to resistance the lif will be. With the hytrol all the way up, the implement is in 'transport' mode and will lift up, same as having the lift in position control, and the hytrol up.
8n owners manual has this info and more, and is pretty cheap.. 8 bucks some places.
Soundguy