Hit SAUTE on the Instant Pot, and when it reads Hot, add 1 tablespoon of butter, the onion and kielbasa, and cook until onions are slightly soft
Hit CANCEL, and use some of the water to deglaze pot, if necessary
Add the sliced cabbage, then egg noodles and then, the water. The water won't cover the noodles, but this is fine. Add 3 tablespoons of butter over the noodles
Place the lid on the pressure cooker, make sure vent is on Sealing position, then hit PRESSURE COOK for 2 minutes. Pot will take a few minutes to reach pressure, then begin cooking
When pot beeps, do a quick or gradual quick release if liquid squirts out. When pin drops, remove lid, and hit CANCEL to turn pot off.
Noodles will not be fully cooked, but start stirring everything together, and they will soften and cook as you mix them with the liquid from the pot. Hit SAUTE and cook for 1 or 2 minutes to help reduce extra liquid if needed.
Hit CANCEL, stir in remaining butter, and add salt and pepper to taste
Pour Haluski into a serving bowl or platter, and serve with sour cream or cottage cheese, if desired