I haven't reinstalled it to check how it's implemented, but I want that history visible on the screen. So that I can do 3 calculations, then look up and see the calculations and results, for instance, to copy them down somewhere.

I'd like multitasking too with multiple apps visible at once so I could copy figures easily from one app to another, like the Android I tried in 2020, but obviously that's asking too much of Apple.