select the UI button

I can select the button only left side…

In there, vr supported mode and checking split stereo display(non head-mounted)

How can I use right side too?


I ask for help. How do I make a button in unity 4.2?
I saw that I had to press the left click and that something was opened to me, but nothing is missing and I do not know what to do to open that menu and make a button?