How can I make letterbox on iphoneX?

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My UMGs are cutted on side.

I want to make letterbox on iphoneX (ratio bigger than 1.778)
I found option for android. But not iOS.
Is there any option or solution?
Please give any advice for iPhone X resoultion ~

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I have the same problem on ios, what was your solution for Android?

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I give up the letter box. I check ios or android, and I check resolution rate. So I could found iphone X or similar iphone. Than I manage every UI by iphone X or not.