The G-Stomper App layout is generally built for screen aspect ratios from 16:9 to 16:10. Screens which exceed that limit will get black letterbox bars either in horizontal or vertical direction. In Landscape orientation, if the letterboxed space is large enough, then a Quick Navigation Bar is displayed instead of the black bars. This is the case on devices with screen aspect ratios of 4:3 or 18:9 for example.
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