There was no screen to find. After boarding, and were waiting before takeoff (or possibly this was up in the air, I can't recall the exact timing), I saw someone in row 1 asking a J FA about PIFE, and he looked around the armrests for them, and the FA said there were none. My husband and I also looked around the armrests of our seats, given we'd flown in the same config 3 yeears earlier, and we could not see the PIFE screens in the arm rests. There were no gaping holes, but there were no screens in the armrests.
There was no "oh, you need to press this button" or "pull this lever" or anything like that with the pax, like what happens when you're in a bulkhead or exit row on most of QF aircraft.
We might have had 3 J FAs who were completely unfamiliar with that kind of plane config. The CSM certainly struggled with the video system early in the flight & read out very old arrivals information (references to the green form) from a manual. We could have also had a full J cabin who took them at their word, and didn't manage to discover how to get the screens out, including myself and Mr Katie.