Missing Transition buttons on iPhone 4S version?

I have your djay 2 app on both my iPhone 6 and more recently my backup 4S. I know some features are missing on the main screen because of the 4S screen size, etc…

I cannot figure out how to transition between turntables at my selected transition duration time. On my iPhone 6, there are left and right arrow buttons on either side of the transition slider that initiate a timed transition. How can I do this on my 4S ? Thanks

As we’ve discussed via Email: Because of the smaller screen size, djay 2 doesn’t have the transition arrow icons on the iPhone 4.
The only way of forcing a transition (before the Automix does it anyway) is by manually switching the Crossfader to the other Deck.