Is it showing the same message every time. I mean, someone said "hello there" when this history setting was "show 25 messages" which is a default. And now you always see this same "hello there" message, but you don't see new ones after you set the setting to show no history, or set it to show 0? Same here and i think it is probably supposed to work like that, though i can't point to the exact paragraph of a group chat specifications. At least it is how Openfire does it. History settings only affect new messages. Ones that you've already received in the past are not affected by these settings. What you've already seen is yours and can't be taken from you with the change of the setting. So, currently your only option is to destroy that room, create a new copy of it, then it will have no old history and as your setting is already "do not show" it won't show any history on joining. Unless at some point you turn it back again and someone joins at that point and gets some old messages, then those old messages will stick with those users, even if you disable showing of a history again. A bit tricky.
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