We have subtasks assigned to a single team member that require manually updating three custom fields within the parent task. Ideally, it would be possible to group these fields without needing to remove and re-add them to the project. While we can sort custom fields in the ‘Show fields’ menu, this does not appear to affect the order in which the fields are displayed in the Task pane view.
I may be misunderstanding but for custom fields I believe when you go to Customization > Fields
The sorted order you apply here is the way they will be sorted in the task details pane.
This however, will not affect the order of Native Fields or Asana Created fields like Estimated/Actual Time.
@Ludwig_V I’ve tried there as well… I swear I was able to do it before, I wonder if it’s a bug? The Charge, Needs to be contacted, and approval stage are grouped in both the fields and show pane, but not the task pane view…
To be clear: It’s definitely the Customize > Fields right flyout that governs the custom fields ordering in the task detail pane (not the Hide or Options menu; that’s for list view columns only).
But your first screenshot shows that order is not being honored in the third screenshot.
Is there any chance the task is multi-homed in another project with custom fields? That can affect things.
If not, I think you should report it as a bug to Support.
Keep us posted!
Thanks,
Larry
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Perhaps it’s due to the changes they previously rolled out for the Customization Menu UI bugging for your tenant? 
I tested a bit on my organization and it appears to respect the order you set on a Project, based on which Project you’re viewing the task from. So if I open Task A on Project A, I get Ordering A. But if I open Task A on Project B, I get Ordering B.
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FYI I moved this out of Product Feedback and closed it since it seems to be resolved.
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