Retirement tax questions

I found this in IRS publication 1040 instructions - Page 25

https://www.irs.gov/pub/irs-pdf/i1040gi.pdf

“Also enter “Rollover” next to line 4b. If the total distribution was rolled over”

That means that if the entire RMD was Rolled over back to IRA, Form 1040 Line 4b should be changed to 0 and the space next to Line 4b should be marked “Rollover”. Line 4a should remain unchanged.

The problem is that TurboTax does not allow me to write "Rollover" in the space next to Line 4b

How can this be fixed?

Thanks