Values
FIT
Screen width and height match target size in settings. Result is scaled to fit into native screen bounds.
FILL
Screen width and height match target size in settings. Result is scaled to fill native screen area.
RESIZE
Screen width and height are automatically resized to exactly match native screen size.
FIT_RESIZE
Either width or height is increased so that aspect ratio becomes the same as as native screen's aspect ratio. Result is scaled to fit exactly into native screen bounds.