Steven Troughton-Smith:
If you want to pixel-peep on iOS or iPadOS, it also has the Zoom
accessibility setting, and can be controlled via touch, keyboard,
or trackpad. It works for display mirroring too, and has other
options like a minimap and HUD (‘Zoom Controller’).
These settings are in Settings → Accessibility → Zoom. I prefer switching the Zoom Region from the default Window Zoom (which gives you large magnifier glass window to drag around the screen) to Full Screen Zoom, which is more like how zooming works on the Mac.
