Retirement tax questions

Hi - I had a follow-up question to this based on one of the very helpful points you noted.  I find myself in the same situation - I over-contributed to Roth 401k accounts for TY2019.  The excess contribution amount was returned to me in March 2020, in advance of the April 15 (assuming no coronavirus) deadline.  I understand that that next year I will receive a 1099R, however I am unsure of what, if anything, I need to do to complete my TY2019 return.  You mentioned in your message that all that is necessary now is to indicate that the excess contribution has been returned prior to April 15th.  Would you mind explaining how to do this?  

 

Thanks!