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Unity games can be run with Arguments

-screen-fullscreen 1
-screen-width 1920 
-screen-height 1080

To do this on Windows the easiest way is:

1. Right-click the game .exe
2. Create shortcut
3. Right-click the shortcut → Properties
4. In the Target field, append your args after the quotes:

1920 x 1080  (1080p monitor)

"C:\Path\To\Game.exe" -screen-width 1920 -screen-height 1080 -screen-fullscreen 1

2560x1440

"C:\Path\To\Game.exe" -screen-width 2560 -screen-height 1440 -screen-fullscreen 1

3840x2160  (4k monitor)

"C:\Path\To\Game.exe" -screen-width 3840 -screen-height 2160 -screen-fullscreen 1