You can already change the order, however, not after it is created by a simple click. But it should be fairly simple to just move over devices after adjusting the layouts. I might make it simpler in the future, but nothing I prioritize.
If you want to move ex. layout 3 to 1, then copy the layout of the largest one, move the disks, then reduce the other one (if the sizes are different). If they're all the same, it's just a matter of reassigning the devices.
Font colors should follow the unraid theme, not messing around with that (at least for now). Choose a better background color