Trying to port our games for iPhone X (and as have no actual device check only in simulator) and they look different in Corona Simulator and Xcode Simulator due to different values returned by these functions:
display.safeScreenOriginX
display.safeScreenOriginY
display.safeActualContentWidth
display.safeActualContentHeight
in Portrait mode:
Corona Simulator Xcode Simulator
display.safeScreenOriginX 0 0
display.safeScreenOriginY 44 132
display.safeActualContentWidth 1125 960
display.safeActualContentHeight 2358 1206
in Landscape mode:
Corona Simulator Xcode Simulator
display.safeScreenOriginX 44 132
display.safeScreenOriginY 0 0
display.safeActualContentWidth 1037 696
display.safeActualContentHeight 2415 1377
Tested on MacOS Sierra 10.12.6, Corona 3168, XCode 9.1 (9B55)