Hello there, glad you're having fun! That option is already available by default, it's just a little 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 to show the screen configuration dialog
Have a good time and stay safe!