Today i figured out that with the new flagship mobile devices the Letterbox scale doesnt work anymore. The aspect ratio is 18.5:9? How to solve that problem? Is there any other workaround than rescale the backgrounds of games?
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What do you mean "letterbox scale doesn't work"?
If your game is designed for 16:9 aspect ratio, then on 18:9 screen you should get black bars on top and bottom of the screen.
Is this what happens?
i think best option for you is use scale inner/outer mode