Slideshow – How to replace or rearrange slides?

I haven’t been able to find a way to replace or rearrange slides other than deleting and then inserting. And when I do that, it always inserts the current inserted one ahead of the last one with no way to reorder them. Which means that if i want to reorder them, I have to delete them all and insert them all again one at a time.

Am I missing something here?