If you need to rearrange pages in your scanned document then this is easy with
First click on the page you wish to move so it is selected with a blue border then
right-click on the page and choose 'Cut Image' as shown below
Select the page where you want the cut page to appear and right-click again then
choose 'Paste Image before selected page'
If you want to page to be placed at the end of the document then choose the
relevant option as shown above.
You can repeat this a necessary