Put instant pot on saute mode.
Add 2 tbsp olive oil in the pot. Saute chopped onions and minced garlic until the onions are translucent.
Add chopped carrots and zucchini. Saute them for 2-3 minutes.
Add uncooked orzo, canned crushed tomatoes, pesto and all the seasoning to the pot. Mix well.
Add vegetable broth to the pot and mix it well. Cancel the saute mode.
Close the IP lid, secure the valve and put it on low pressure for 4 minutes (half of the cook time from what box instruction says).
Once the timer goes off, let the pressure release naturally for 5 minutes. After 5 minutes, let the pressure release manually.
Once the security valve releases, open the lid and stir the orzo. Wait for orzo to cool down some.