Add meatballs and spaghetti. Add meatballs to the bottom of the instant pot. Top with broken spaghetti noodles, spread out. Make sure to keep spaghetti on top of the meatballs.
Add the rest of the ingredients. Add the crushed tomatoes, tomato sauce, broth, Worcestershire sauce, brown sugar, Italian seasoning, and salt. DO NOT STIR. You can move the sauce around to cover the pasta, but don't stir.
Cook. Place the cover onto the instant pot and turn to seal. Cook at high pressure for 9 minutes. Do a quick release. Use tongs to blend the pasta and sauce. Serve.