I get a crate can be too big and why, but what are the negatives of letting a puppy have accidents in the crate? Will it make my pup think the house is OK?

If a crate is too big I get that the puppy will go toilet one side and sleep the other, but will this slow down potty training, if it was smaller would my pup still have accidents in the house etc?

13 week old Frenchie (yes I know a baby still) knows to pee outside, but she doesn't give me any signs to go and will sometimes watch me as she squats to pee. Doing all the usual like out ecvery 30 mins or so treats and praise etc