Go to the Project Map in the Navigator window.
By default all IE's have the same REFERENCE ID, something like IE-01-08.
Open the interior elevation settings.
To change their order, in the IE Settings Window, renumber the last two digits - .
You want to have IE-01-01 and IE-01-02, etc. See image.
What I did was choose the last elevation and changed the ID to IE-01-01,
it automatically moved from last place to first place...