Your eSIM connects to Movistar inside Ecuador. Movistar is one of the country's biggest carriers and it is known for being fast in the cities. You do not need to pick a network or change any setting. When you turn the eSIM on, your phone finds Movistar on its own.
Because it is a real local network and not a roaming partner, your data routes through Ecuadorian towers. That keeps speeds higher and lag lower than the old style of foreign roaming.