By default, this is a Background.png image. This should be a 173x173 PNG image. In addition, if you need the background color of the theme (for example, with built-in applications), be sure to make the background color of the tile image Color.Transparent.
If you ask about the dynamic panel of the launch screen, you will need to check the push notification system, as this is the only way to change the tile image based on external influences (= when your application is currently not running).
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