I guess you are trying open/load FlappyBird in your application using Loader?
Whether the game is loaded within the application or in a new window simply depends on what you load.
The FlappyBirdMain.qml item for example is a GameWindow, which results in a new window opening up when loading.
However, the game itself and all the relevant code is handled by MainItem.qml, which you can use to load the game without a new window opening up:
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