Hi! This is already implemented in the game, it's just hidden away. Depending on your OS there are different ways to achieve this:
- On Windows, press ALT + ENTER to toggle between fullscreen and windowed modes
- On macOS, press CMD + F to toggle between fullscreen and windowed modes
- On Linux, pass the argument "-show-screen-selector" to the command line in order to show the configuration dialog
Thanks and have a good time!