Mortgage interest on paid loans

Where do you enter mortgage interest for home loans paid off in 2020? I cannot enter a 0 for "Outstanding mortgage principal". But we don't owe any more on the loan.  I didn't receive a 1098 this year, apparently since the mortgage interest was less than $600, but did receive a note from the bank with the amount of the mortgage interest paid in 2020.  However, as noted above, if I try to enter this information in the Mortgage Interest section, it requires I enter something above "0" for Outstanding mortgage principal.

 

Thank you for your help.