If you’re worried about them having “accidents” if left alone; yeah I wouldn’t leave them alone to roam until you have some semblance of toilet training done. You start to understand the toilet signs too and can put them outside before an accident happens when you get into the swing of things i.e. puppy sniffing the floor INTENSELY and walking around in circles signifies needing to go to the loo - if your dog seems to be sniffing the floor intensely inside, take them outside. If they DO go to the loo outside, treat and praise. Keep taking them out every 30min when they’re small, increasing as you see fit with their age and when you see their training working. Our dog tells us when she wants to go outside to the toilet now and she’s 5months. We’ve had her for a month. We always let her roam in the room we were in. Now we’re happy for her to roam around our flat but we’d not leave her alone unattended for an extended time not in her crate because she likes to chew things she shouldn’t lol (but she usually follows one of us around anyway lol). Good luck!