To see data from an inactive client, navigate to Clients on the left-hand menu.
Select add filter -> Select license -> select No license-> select apply
Next, find your client from the no license list
Select the ... on the far right of their listing, and choose "Go to client's home".
This will take you to that client's landing page, where you can then access all of their programs, history, graphs, etc. The only limitation in this view is that you cannot run new sessions or take new data unless a license is re-added to that client's profile.