Place the cranberries, orange juice, chopped apple, and maple syrup in the Instant Pot. Turn the knob to Sealing, and set the pot on Manual for 3 minutes at high pressure. After the pot comes to pressure and the 3 minutes of cook time have elapsed, let the pressure release naturally for 10 minutes. Then turn the knob to Venting to let the remaining pressure release (if is hasn't already).
Remove the top and mash the cranberry sauce with a wooden spoon or a potato masher. Press the Saute button and heat briefly to thicken (1 to 2 minutes, or to taste). The cranberry sauce will continue to thicken as it cools.