Be Careful ... if you owe and choose to mail the payment there will be ONE 1040-V for the 2020 balance due to mail in with a payment.
HOWEVER since you owed on the 2020 return the program may have populated FOUR 1040-ES forms which are for the 2021 quarterly estimated payments if you need to make them. These will NOT pay the 2020 balance due they are ONLY for pre paying your 2021 taxes in advance so you don't owe again next year. These are not mandatory simply suggestions.
