Are you referring to the Tax Summary window using the desktop editions?
I am using the TurboTax Premier edition for Windows with the latest updates. When I click on Tools at the top of the desktop program screen and then click on Tax Summary, the Tax Summary window is not greyed out.
I have the same problem. The FED Tax Summary becomes greyed out ONLY after I add the CA State to the return. Once CA State is added, the FED Tax Summary is greyed out but the CA State Tax Summary is OK. If I then remove the CA State from the return, the FED Tax Summary is now OK (not greyed out). This is repeatable. It seems, at least for my TurboTax Premier 2024, that adding the CA State does something to the Federal product to cause the display problem on the Tax Summary.