When you add the vinegar make sure to scrape the bottom of the pot with a wooden spoon to remove all the brown bits. This will not only add flavor to the sauce but it will prevent a burn notice.
Make sure that you allow this Instant Pot Adobo Chicken to complete a natural release for at least 10 minutes. This prevents the chicken from being tough.
You shouldn’t have a lot of liquid left, however, if there is too much liquid you can turn the pot on saute and add a cornstarch slurry to thicken it then pour it over the chicken pieces.