Dehumidification (Dehumidify) Mode on select portable air conditioners means that the unit operates in normal mode with the exception that the indoor fan does not operate. The cold coils inside the unit will attract moisture. You cannot change the fan speed when this mode is selected. Run the unit in Dehumidify to remove some moisture from the air, and turn it off when the room is at your preferred comfort level.
Since portable (and window/built-in) air conditioners are not dedicated dehumidifiers, the number of pints per day is not published. You also cannot set a relative humidity percentage.