This is simple. Use align to parent. Make two groups inside of it, 1 group your first section you want to be visible on load, and the 2nd will be hidden until you make it visible.

On your “next” action, just animate the visible one hidden (fade out) and animate in the hidden element (fade in).

Make sure the hidden element (one you want visible) is on top. You can do so by right-clicking the element and clicking “Bring to Front”.

When you do that, the element will get pushed to the bottom of the group. That is intended. The last item in your groups always has the layer precedence.

Hope that helps!