Customize Game Window (For Exported Project)

Does anyone have an idea of how to customize the game window? What I mean is being able to style the minimize, and close buttons. I wanted to change how the game looks after it’s built. I know about the Build Settings and the player settings but, I wanted something that was a bit more fluid and less constricted. I hate how when you maximize the screen you can’t go back to minimize and unless you include a quit function, the only way to close the program is by using the Task Manager. If anyone has any details or ideas, please contact me or leave a message below.

Why don’t you just add your own at the top?

You can use UI for doing so.