The program always chooses the method that gives you the lowest legal tax liability UNLESS you override that choice in the FORMS mode in the downloaded program. The original poster what calculating the tax using the tax tables manually and did not use the QDCGTW like the program does.
Since the ONLINE version is currently in transition from the 2018 to 2019 version I am not sure how you could be using it at this time. So to review the method chosen by the program you will need to review the worksheet ... save a PDF of the return WITH all the worksheets when the Online program goes live again sometime in December.
