Once the 8 hours or desired incubation time has been reached, turn off the Instant Pot. If the yogurt is lumpy, whisk it until all lumps disappear. For thicker, Greek style yogurt, strain some or all of the yogurt through a tea-towel into another container, but remember that the yogurt will thicken more in the fridge. (I strain about half and then mix it back into the rest of the yogurt.)