You know when you start up a game and the Start Game button is highlighted for you that hitting Enter will start the game without you having to use your mouse? That's what the First Selected property does for you.
You can drag and drop any intractable UI element into this slot to make it the first selected UI item in your scene. This is particularly helpful for games that do not use a mouse or touchscreen, but rely solely on a gamepad, joystick, or keyboard.
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