Section Tab Missing on Document Tool Bar
It was changed in Pages 10.
Mentioned here, but I found it to be tricky to get to, especially without much experience with this app. For one thing, you have to make sure thumbnails are visible with View -&gt; Page Thumbnails.

Here you can see the thumbnails on the left. On the right hand side you can only see Format and Document. 

Finally after clicking on the thumbnail, Section finally shows up. IT WILL DISAPPEAR when you click in the document body.