Sometimes if a lot of accounts in adjacent shards go inactive, they will merge shards to keep it active, but that's not in your control.
Dev have stated this is not true and that they would give advance notice if they ever decided to implement it. I doubt they'd ever do it as it'll open the floodgates to requests for transferring out of your own Leaderboard
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Yes, there is no way to change that group, they are locked.
This is absolutely not true. They have stated in multiple times they do not and cannot do this.
It would be overwhelmingly obvious if they did.
Dev have stated this is not true and that they would give advance notice if they ever decided to implement it. I doubt they'd ever do it as it'll open the floodgates to requests for transferring out of your own Leaderboard