Two pages first spread
Hi,
I wanna create the first spread with two pages (one left and one right page) like this:

I am trying to do this with the following code:
app.activeDocument.spreads.item(0).allowPageShuffle = false;
var newPage = app.activeDocument.pages.add(LocationOptions.BEFORE, app.activeDocument.pages.firstItem());
But it only creates the pages side by side like this (they stay both on the right side of the spread):

How can I move the page to the other side to archive the result that I am looking for?
Thank you so muck in advance!
Best regards.