It will show as income on the summary screen which shows gross income, not taxable income.
The IRS requires reporting all income on a *income* tax return - taxable and not-taxable.
The income will be reported on line 4a (or 4c) and 4b (or 4d) on the 1040 form with the word “ROLLOVER” next to it if it was a rollover.
The taxable amount will go on the 1040 line 4b (or 4d). In the case of a rollover, nothing goes on 4b (or 4d).