Retirement tax questions

The 2020 1099-R Block 7does not have a 2nd drop down block.   There is only one block and the 7D is there.  On turbo tax 2020, the 2nd line down has different codes.   D is for Death.  The D in block 7 on the 1099 now is for disability, which applies to me but the block on Turbo Tax will only take one character.