The goal is not necessarily to reduce your display size but to make your screen size match the display. That means effectively scaling the display to fit will create the desired outcome.

You can reduce the size of your display screen using the Windows Screen Resolution utility or the Display app. Launch the Screen Resolution utility by right-clicking an empty spot on the Desktop ...

It won’t minimize the window, and instead, you will find it on your screen. If so, you can drag the game window to the other monitor as per your will. It is as simple as that. If both monitors ...