code: public void goBack() {
          if (mContentSceneViewStack.size() < 2) {
              return;
          }
  
          mContentSceneViewStack.pop();
  
          Log.d(TAG, "Go back to %s", mContentSceneViewStack.peek().getName());
          executeHideShowCycle(mContentSceneViewStack.peek());
      }
docs: Go back to the previous stacked content scene.
  The currently active content scene is popped from the stack and moved to invisible state.
  (see {@link ContentScene#hide()}). The next content scene in the stack is moved to visible
  state (see {@link ContentScene#show()}).
  if you continue to run {@link #goBack}, then each content scene in the stack is popped off to
  reveal the previous one, until the last one is left in the stack.