I just went through the same situation. None of the responses seemed to make sense - I was not getting the option to unaggregate. I didn’t want to delete and recreate the rentals. On top of it, TT didn’t allow e-filing with business aggregation worksheet which was a hugely unacceptable. So I switched TT into forms mode (available in the desktop version). Then went to 8995-a QBI worksheets for each property. I deleted those worksheets and automatically TT unaggregated the two rentals. That is the simplest and most sensible solution. Otherwise you will be going around in circles and not be able to e-file.
