not sure if that will resolve your problem, but the way I figured to "sort" items is to put numbers at the beginning of category names. Otherwise once created I was unable to rearrange them and sort in any meaningful way:
![Rafal_Bainie_0-1674551216742.png Rafal_Bainie_0-1674551216742.png](https://experienceleaguecommunities.adobe.com/t5/image/serverpage/image-id/52742i6A91758BDA2BBF54/image-size/medium/is-moderation-mode/true?v=v2&px=400)
You can go in and edit numbers in names whenever you want. It's manual, but at least it works.
I look forward to updated calendar functionality WF is working on.