Dark background no light

I had a djay 2 installed in my mini iPad, so last night i restored my iPad, when I wanted to installed djay 2 . I installed but Djay pro for a fee. Since I installed djay pro I been have a problem, there is no background light, I even google the problem. I saw in one the help were you need to on the dark switch, but in my app you can not see that switch because that front is all over my screen. I even re-install the app and install it back no different.