Scaling, Resolution, Display Settings

[vvvvan]

I prefer to play PC games in a window, for various reasons (lower resolution results in better performance, or higher quality settings, easy tab out, etc). On a 4K monitor, usually a 2560x1440 window is nice. However, Chimera Squad seems to be scaling everything? (Yes, Windows scaling is set at 150%, but this usually does not effect anything except UI elements and text; not graphics, videos, photos). Example: If I set the XCS video settings to "2560x1440", window is almost off the display, and "1920x1200" takes up much of (3840x2160) screen. No setting to change this behavior that I can see.

TL;DR: Why is it scaling everything, not just UI (and with no indication)? Why not allow me to select actual 2560x1440 and just scale the UI (like other games)? Is this common or lazy behavior for games, or Firaxis / 2K games?