Well, I am reviewing the Customizer template with a customer. We cannot reorder the images in the Demo.
I’m sure its under our noses.
I only know how to do that manually ie in Appearance>Media take them out and put them back in the order you require. Sorry!
May be easier to delete that slider and start again?
You simply drag them up and down into the order you want.
He was pretty clear: in the Demo.
You cannot edit the Demo, because Demo is not really a slider. It’s made up from code, so you see how a slider would look/behave if you had one.
You can edit your own sliders (including reordering) from the edit screen of any of its images. Actually you can do it from any image’s edit screen (you add it to the slider, edit the slider and than remove it from it).
But you can’t reorder Demo.