Healthy to see the make up
Sometimes you can't help it. Hopefully you can keep it at a minimum and not be cruel.
If your kids do witness an argument I think it's super important for them to see a resolution. To show them that you two love each other still and even during a fight. That one or both apologizes and hugs and then they can see it pass and love again.
It can teach them humility and strength in knowing you don't have to be right and that saying sorry isn't a weakness.
Strength comes from knowing when to admit you're wrong as well as forgiving someone when they are.