@SteamTrain @Anonymous_
How ridiculous! But thanks for the workaround.
Yes, it seems that once you get to an FAQ, the Search box appears. The FAQ doesn't have to be related to what you are searching for. Any FAQ will do. So here's a relatively quick way to get the Search box. When the Digital Assistant first opens, click "Amend tax returns." Then click "Tax-year 2022." Then the Search box will appear.
I also see that the Digital Assistant is remembering all of the interactions, even after I close the tax return and open a different return. The only way to get rid of the history seems to be to exit from TurboTax. When you run it again, the Digital Assistant starts over.
