Break 4 of the noodles into 2-3 pieces each and layer in the bottom
Top with 1/2 of the ricotta cheese and then with about 1/2 cup of the marinara
Repeat the noodle, ricotta and marinara layers
Top with final 4 broken noodles and remaining marinara
Cover, seal and set to high pressure for 5 minutes
Allow 10 minute natural pressure release then turn valve to release remaining pressure
Remove lid, top with shredded mozzarella and let set for 10 minutes before serving
Notes
Instant Pot will take 10-15 minutes to come to pressure, about 5 minutes to cook and 10 minutes to allow for natural pressure release. Hands on cooking time for this recipe is about 10 minutes.
I made this in a 6 quart pressure cooker
Lasagna will appear very watery after cooking. Let stand with lid off for at least 10 minutes before serving to allow it to firm up.