I hate these threads.
Dogs are so individual, the different breeds have different traits sure but there’s no such thing as a universally tolerant breed.
Tolerant, friendly dogs are the result of friendly, tolerant parents and training.
It’s not necessarily breed specific.
Take my dog.
She doesn’t like other dogs much but I think she would make an awesome therapy dog as she is super tolerant, loves children, very well trained and if asked will sit or lie down quietly for however long I need her to.
She has done talks in schools being surrounded by children and done great and I’ve taken her to busy fetes where toddlers have stroked her and she takes it all in her stride.
You would probably assume she is a retriever or staffy or some other breed known for their tolerance and friendliness.
Would you guess that she is in fact an active, driven, working bred border collie?
My husband had a staffy that was child aggressive (widely thought of friendly breed, ‘nanny dog’).
Don’t focus too much on the breed.
Look for parents (any breed) with stable, tolerant temperaments and you stand a good chance with good training of moulding the pup into what you are looking for.