Among my favourite pizzerias in Milan, Lievità is such a must try. They have several branches throughout the city, but I often go to the one in Via Sottocorno, in the Tricolare neighbourhood.
Compared to other pizzerias, their pizza is super light and very digestible. I often come here and love to try some of their special pizzas. They also have several vegan specials.
This is easily in my top 3 of pizzerias in Milan, and if you plan to go make sure to book in advance.