In the Pages flyout menu
Allow Pages to Shuffle
Allow Selected Spread to Shuffle.
Fromthe pages panel flyout menu make sure Allow Document Pages to Shuffle is checked, and also Allow Selected Spreads to Shuffle for any spreads that show the numbers in brackets if you want them to be able to rearrange as well (in this case you have two pages numbered 2, and that's a problem since by default ID wants to arrange even numbered pages tothe left of the spine and odds to the right).
Awesome! Thank you so much, Peter, that worked!
Also, I actually had to UN-check "allow selected spreads to shuffle" to get it to work. I had both of these options selected when I asked my question.