How do I enter "Supporting Details" to an entry in Turbotax? Right-click and Double-click do not open the window. Are there other (legacy?) ways to enter details?

Where are you seeing a need to enter 'supporting details' for tax preparation expense?  In the TurboTax interview, just the amount is entered.

This amount shows on the Miscellaneous Deductions Worksheet, and is not deductible on your Federal return on Schedule A, but transfers to your state return.  

Here's more info on Tax Preparation Fees.

@lhleclairjr