It's been ages and this is from memory but..
Go into controllers before you go into layouts, select custom PC stick (should be at the far right of the otions), exit back and the custom layouts option should now be available. There's a bug that means you can't map zoom.
If you just want to change a couple of buttons around it's probably easier to re-configure the stick it's self, I use a custom preset on the same stick as you've got, just to swap a couple of buttons around for comfort.
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