@anon23122283 (and @lpb),
Julie, you are exactly right: the current implementation of PT 2.0 does not include the selection shown as “2” in that screenshot in the docs. (Hopefully the docs are just a bit ahead and that will be introduced in the product.)
Currently the default behavior of a template is to be based on the project start date; if you want to change that so as to work off of the project due date, it has to be done in the way you described; that is, click on a due date of any task, then click on “After project start date”:
which leads to this screen where you can change it to “Before project due date”:
That’s an extremely non-intuitive way to make that change, so I’m assuming Asana realized it was too hard to find and they are adding the much-more-visible selection shown as “2” in that docs screenshot, but it just hasn’t quite made its way into the released product yet (as I say, I sure hope so!).