Retirement tax questions

Now I'm trying to fill out my taxes since the form is now available. 

 

Since the withdrawal was from 2020, I did not receive a 1099-R in 2021.

 

How do I enter any information about the withdrawal being split over 3 years if the only 1099-R I have is from 2020?

 

Also, the amount should have been divided up into 3 parts, but on the page where it shows my income comparison for 2020 & 2021, the full amount of the withdrawal shows under 2020.  Shouldn't it just be 1/3 of the amount over 2020, 2021, & 2022?