Apparently that function of the topic list isn't implemented, I'm not sure such a section of TurboTax even exists. All of the QBI entries are made while stepping through the sections for sole proprietorships, farm businesses, Schedules K-1 (Form 1065) and Schedules K-1 (Form 1120S). I've gone through each of those using the latest release of TurboTax and have had TurboTax create all of the necessary linkages and populate TurboTax's QBI sections of Schedule C, Schedule F, Schedule K-1 (Form 1065) and Schedule K-1 (Form 1120S). Previous versions of TurboTax didn't establish all of the linkages and ask all of the necessary questions in each of these sections, so it's necessary to go back an revisit all of the pages associated with your particular pass-through entity. TurboTax then uses the information to populate the QBI Component Worksheet, QBI Simple Worksheet (if needed) and the QBI Deduction Summary Worksheet. So, if anything, the only thing missing seems to be a way in step-by-step mode to view the results of the QBI Deduction Summary Worksheet.
I think that the people who are not seeing a result on Form 1040 line 9 just haven't gone back through the business entity entry to allow TurboTax to bring the QBI entries and linkages up to date. For Schedules K-1, the appropriate Other information entry for Section 199A income needs to be present on the Schedule K-1, otherwise TurboTax won't know the QBI amount being passed through from the partnership or S corp.