I.R.I.S. Readiris Corporate 12 for Mac User Guide - Manual (Page 21)

Readiris TM Corporate 12 – User Guide
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 When a document has been opened or scanned in Readiris you
can view its page thumbnails in the image drawer. Click the
drawer icon to open it.
The drawer can open both on the right-hand and left-hand side of
the Readiris interface, depending on its position on your screen.
The drawer allows you to move pages inside a document: simply
click the pages you want to move and drag them to another
position. It also allows you to mark pages as cover pages and
change the recognition language per page by Ctrl-clicking.