Go to Document Setup in the : it is under FILE menu. You will see a check box on the right side called : "FACING PAGES" , click that OFF, and your pages will stack on top and go top to to bottom.- ok when you view. It will NOT be in a SPREAD view*.
You can also use a key shortcut to go to that Document Setup Window : Command / Option /P, combination.
Pages panel menu button > View Pages > Vertically