Stop looking at the share disk allocation page.
Seriously, the only way you are going to achieve total zen of disks being used totally equally while simultaneously keeping all related folders on a single drive is to manually move things from disk to disk. To do this safely without losing or corrupting data means learning how Unraid constructs user shares from disk shares, and using mc at the console or a similar file manager strategy to slowly sort things out. You have a royal mess on your hands OCD wise, it's going to take many many hours, probably weeks worth of moving files to completely reorganize things.
The alternative is to let Unraid do everything as it's been doing it. possibly change to high water instead of most free so future additions stay better organized. Unraid is perfectly happy to present all your disks together in the user share structure, and retrieve all the files from all your different disks seamlessly without you even knowing unless you poke your head under the covers.
If you really must poke, don't start actually moving things around until you have a solid understanding of what and why you are doing. You were warned, here be dragons. It's not particularly difficult once you get into it, but jumping in without full knowledge will burn you.