I hope this feature comes back. Maybe more abstractly across more of the interface, or with better UX? I can’t see why else a feature would be entirely removed. The group name index prefixing is just highly unprofessional and a worn out workflow, so this ability would be valuable in many UI contexts. Oddly, this feature is still in the documentation:
Creating and Using Material Instances in Unreal Engine | Unreal Engine 5.2 Documentation.
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