I’m only using side displays for logs or something I don’t need to refer to often and can see by side vision. Same for large “viewport” angles like tv right in front of me. Can’t stand turning my head or reading at an angle (even if it’s good-angle ips). However you arrange your screens, the field of your effective sight remains the same.

Multiple displays is just a physical solution to the core issue: desktop window managers and software and hardware suck. You can’t have an event-transparent overlay of a compiler/runtime output over your ui testing area, you can’t have windows that slide in from the side on a hotkey or a click, showing quick status when “holstered”. You can’t reveal/popup a window when text in it matches a regex. You can’t assign a hotkey to a browser tab. You can’t custom-dpi a specific window. You can’t have drawers with links in them that are already preloaded and ready to refer to. You can’t have a special set of keys to launch, raise or shift windows temporarily. You can’t scroll on a keyboard. It’s all stupid and fixed even with advanced WMs, or requires programming comparable with creating a new WM and most apps from scratch. And it’s always arcane combination of two-three-four keys, most of which live in rural areas of your keyboard.

Funny thing is, 3d games figured it out with huds, OSD messages, consoles, choice wheels, trivial panning, zooming and movement, “physical” buttons and switches, and 3d itself.