itch.io

I use the Unity Standalone Player command line arguments, and let the game settings assert the window mode with my preferred resolution.

1. Create a Shortcut for the executable;

2. Open the shortcut’s properties (alt+enter)

3. Then add the parameters to the Target text box, after the executatable name/path. (outside the quotes if present). for example:

   "C:\Just in Slime\Just in Slime.exe" -screen-height 960 -screen-width 1920
   

4, Click Apply, and then launch the game via the shortcut.

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Options

• -screen-width
  Override the default screen width. This width value must be an integer from a supported resolution.
• -screen-height
  Override the default screen height. This must be an integer from a supported resolution.
• -screen-fullscreen Override the default full-screen state. This must be 0 or 1.
  • 0 – Set your app to a standard, non-full-screen movable window, the size of which is dependent on the app resolution.
  • 1 – Set your app to maintain sole full-screen use of a display. Unity adds black bars to the rendered output to match the display aspect ratio to prevent content stretching.
    [I don’t remember if Unity fits the edges of the field-of-view inside/outside of the display area]
• -window-mode (Windows only)
  Override full screen windowed mode. Accepted values are exclusive or borderless.
  • exclusive – Set your app to maintain sole full-screen use of a display. Unlike Fullscreen Window, this mode changes the OS resolution of the display to match the app’s chosen resolution [by default]..
  • borderless – Set your app window to the full-screen native display resolution, covering the whole screen [by default].
• -popupwindow (isn’t supported on macOS)
  Create the window as a pop-up window, without a frame.
• -monitor N
  Run Standalone Player on the specified monitor, indicated by a 1-based index number.
• -single-instance (Linux and Windows only)
  Run only one instance of the application at the time. If another instance is already running then launching the application again with -single-instance focuses the existing one.

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For more technical information, see Player settings ; Settings that let you set various player-specific options for the final game built by Unity.

also A Unity specific wrapper that overrides resizableWindow could work, but is also a very easy vector for a hacker to spread a RAT/trojan.