The two ways to.do it: hittin record as Mitch said or shift and choose the pages in the last 4 rows. If you want to select the same page for all the tracks I’m afraid that you have to do it manually one by one. Estimated time for that: 2 or 3 seconds so it’s not that bad
I just got my play +, and its one of the first things I have come looking for…
I feel like the major benefit of the Play+ is the consistent visual feedback, and if you want to utilise that benefit with a full 64 step beat, your choices are -hold shift and roll your finger down the tracks each page turn - or Live Rec mode (which has its own dangers if you start tweaking and forget the mode, before you know it the undo buffer is filled and you have made changes that are locked in)
I definitwly think an option for each track to display whichever page its playhead happens to be on, (without live record being enabled) would massively improve the device.