TurboTax will determine if if you are eligible for QBI based on the information you entered. Before you do anything, try searching for QBI, using the magnifying glass, and typing QBI. As I mentioned before, TurboTax calculates the deduction automatically so it might just populate again. If this doesn't bring back the calculation, you might have to delete your business information and enter it again.
For more information about QBI, see the following TurboTax help article:
