Resizing from US letter to A4

Setting facing pages sees your layout as two page reader spreads. If you don't set facing pages, InDesign doesn't see them as a two-page reader spread and even if you manipulate layouts to show two pages, it will still be portrayed as two separate pages.

You flipped the magic switch. With the facing pages option selected, that document will be two-page spreads forevermore ... or until you change it.

Glad things are working well for you now,

Randy

Let me ask a few questions:

How does InDesign respond when you create a new document with facing pages at A4 size?

Are you just going to your Document Setup to change your page layout? Or are you using InDesign's Liquid Layout functions to adapt your existing layouts to A4?

At this time, how large/how many of your existing document(s) do you need to change from US Letter to A4?

Answers to the first two sets for questions will help us determine your best course of action to adapting your layouts. Answers to the last one will help you determine how much work you need to do to get past the issue ... and on a practical basis which solutions will be time- and cost-effective for you to deal with them.

We're here to help; we just need more information to be able to help you.

Randy