The code section is §280A, not 280(A).

If you have made the input under Schedule E > Schedule E Worksheet for data entry for Days rented at fair market value and Days of personal use, the allocation will be done automatically.  You should also review whether Lines R and S may be applicable to your client.

The allocation and limitation will be computed and shown on the same input screen.  If you want a printed copy of the worksheet, it will be printed with the Preparer Copy or you can choose to print just the worksheet by selecting Print Selected Forms with Schedule E Wks.