Is there a place to adjust the % of business use on the Depreciation and Amortization Report?

No, not on the Depreciation and Amortization Report.  You have to use 'Quick Zoom' from that report to jump to the 'Asset Worksheets' to adjust the % of business use manually.  

Can you explain this further?  How do you use Quick Zoom?  Where (other than in the PDF) do I find the Asset Worksheets?  I have changed the Placed In Service date several times on the appropriate screen but the Depreciation and Amortization Report still has the incorrect date.

You click on FORMS in the upper right corner of the desktop software to go to Forms Mode  (you can't manually change forms in the Online versions).