Hi! I’m starting now to use this app. But i can’t manage to extend screen, and set full screen on TV display and work screen on iPad. TV display is just duplicating my iPad screen. Thank you and sorry for my bad english, I’m from Italy.
Try to disconnect your external screen and restart the app completely.
Than connect the lightning adapter again.
Right now, with iOS 11 there are many issues with the external screen.
Will get fixed as soon as possible.