Do you leave multiple dogs out/loose alone together in the house when you’re gone?

When you leave home, do you leave multiple dogs out alone together loose in the house? Do you crate one or more dogs to avoid issues? Our trainer says that she never recommends leaving multiple dogs loose in the house even if they love each other 100% of the time and have never fought. Curious to see what most people do as we just got a puppy and have a six-year-old dog. We plan to keep the puppy crated and our other dog loose since he’s not destructive and never has been. She’s a question mark on that front lol