ios - ViewController doesn't cover entire screen -

does know why view controller doesn't cover entire screen?

the view controller created size of "iphone 4-inch" , i'm running on simulator iphone 6s plus phone. usually, view controller auto resizes whatever iphone device select, it's not doing anymore. storyboard in view controller created has "use auto layout" , "use size classes" selected believe did me, since it's not working i'm not sure need work.

thanks help!