Get your taxes done using TurboTax

Yes, being able to record supporting details is a helpful feature. I have found that I can still right-click, or click the "+" sign, on entries in the Worksheets in Desktop versions of TurboTax to get the pop-up worksheet to Add Supporting Details, once you get to the originating worksheet (such as the Form 1099-DIV worksheet). See screenshot below.

It's in the actual tax forms that you can only get the magnifying glass to trace the source of a line item, or right-click and get the About/On Demand Tax Guidance information.