チャットの保持期間を0（無期限）に設定すると「チャット履歴は0日間保存されます」と表示される

[JammyDodger]

Good spot. I can confirm that it does say a misleading thing if you set the retention period to be indefinite:

And it also says it by default for all Personal Chat settings pages too.

Let’s see if we can get that tidied up.