I hate to be the bearer of bad news, but this feature request has been declined.
-WarrenFIX THIS NOW supported this idea ·FIX THIS NOW commented
This simply MUST be revisited and included in a future release. We MUST be able to perform AT LEAST ONE of these actions: Rename /Hide /Remove, for both conversations and Files. The tool is dead on arrival if we, as administrators cannot customise this basic stuff. We integrate our 3rd party cloud storage as an additional tab, so we're left with duplication for file storage and lots of confused users and lots of user queries being generated.
What a huge step backwards from SharePoint. We are a very large enterprise customer (~100K users) and will have to consider other options soon.