Once you carryback 5 years it is possible that the loss would be used up in less time so you will not need the extra columns ... from the 1045 instructions :
If you carry back any portion of an unused NOL or general business credit to tax years before the 3 years preceding the 2020 tax year, you may need to use additional Forms 1045. Complete lines 1 through 9 and Schedule A on only one Form 1045 for the earliest preceding tax years. You must sign this Form 1045 but don’t need to sign the other Forms 1045.
https://www.irs.gov/forms-pubs/about-form-1045
