Welcome to eazyBI community!
If you want to sort rows Alphabetically, you could create a new calculated measure (Calculated measures and members) with formula below
[Sprint].CurrentHierarchyMember.Name
and then sort this column by left-clicking on measure name.
See screenshots below:
Then you can remove this column, but sorting will still be active in the background
Best wishes,
Elita from support@eazybi.com