+1 Just finally realized myself why I kept losing dashboard customization. I completely agree that the dashboard display settings should be saved in the Unraid OS. Otherwise, it's a waste of time.
Who wants to reconfigure their dashboard over and over again just because you had to clear cookies or are using a different browser or computer? Nobody. It's a UI/UX decision that leads to users slowly learning that they shouldn't bother. Net result: why have the feature at all?
Plus, I'm sure I'm not the only one who didn't discover this until after they had taken the time to carefully reconfigure the dashboard a half dozen times or so. Each time shrugging off the lost settings as a glitch or caused by an update. Definitely not bothering again until it's no longer cookie-based.