Why are some of game screens cut off while playing on mobile devices vertically?

When playing games on mobile devices with vertical orientation, the screens are cut off. This is a well-known issue and we have already been aware of that. It causes by lacking of supports from the original game providers. Some of the providers support to automatically turn to full-screen view or automatically scale accordingly to mobile devices' screens and orientation. Some of them do not. Therefore, we will not fix this type of issue since it will affect the core structure and to prevent any conflict later if the providers extend their supports. But we will keep you posted on any updates as soon as possible.