I do not know if some airlines still use the upper deck for F. On the airlines I fly no.

In the 70's, the upperdeck as well as the front of the plane was F.
Swissair for example had its seats downstairs and a lounge upstairs with bar and and large array of food to pick on.
One was able to smoke, too... That was flying. The seats were less comfortable but the walking up and down was good for exercise.

Pan Am even had a "table restaurant" and one was served exactly as in a real one.

Philippine Airlines, if I recall rightly, had little bedrooms with pyjamas, etc.

Soon the airlines realized that they were loosing a lot of revenue by not selling the space available for seats. So, very fast, all this luxury disappeared.