1099r distribution and 100% repaid

Don't enter 0 for the 1099-R; TurboTax does handle the return of a distributed 2020 RMD (required minimum distribution)  Form 1099-R is required to have the entire gross amount in boxes 1 and 2a, box 2b Taxable amount not determined marked, the federal tax withholding in box 4, code 7 in box 7, the IRA/SEP/SIMPLE box marked and any state tax withholding in box 14.

Since RMDs were waived for 2020, no part of the distribution was actually an RMD even though it was taken with the intention of satisfying an RMD.  In TurboTax, indicate that the distribution was not an RMD.  Indicate that you moved the money to another retirement account (or returned it to the same account), then indicate how much of the distribution you returned to the IRA.  TurboTax will include the entire gross amount on Form 1040 line 4a but exclude the amount rolled over from the amount on line 4b.  TurboTax will also include the word ROLLOVER next to the line.

If you did not substitute other funds for the amount withheld for taxes so as to complete the rollover of the entire gross amount of the distribution, the amount of the withholding remains distributed, not rolled over, and subject to tax; it's too late to complete a rollover of that portion of the distribution.  If the overall tax liability determined on your tax return is less than your total withholding, including the amount withheld from the IRA distribution, you'll get a tax refund.

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