Turn the Instant Pot to "Saute" for 10 minutes and let heat for 2 minutes
When heated, spray/coat the pot with the oil and add the onions and beef cubes
Brown the beef cubes for 5 minutes, stirring occasionally to brown all sides
Cancel the "Saute". Add the rest of the vegetables and liquids to the pot, stir to combine. Do not add the arrowroot powder
Put the lid on and seal the IP
Turn the IP to Manual Pressure Cook on High for 10 minutes
When the timer is done, allow the clock to count up/Natural Release for 10 minutes, then Quick Release the rest of the way
Remove two cups of broth from the stew and mix with arrowroot powder in a small bowl to make a slurry. Add slurry to the pot and mix well to thicken
Serve immediately, or refrigerate up to 1 week