Specify the number of history messages you want to see in conference or private dialogue when you open the conversation. By default, 50 messages.

 

You should not set big values on slow computers because the dialogue window will be opened slowly.

 

Load history to conferences

If you disable this configuration, previous messages won't be displayed in a dialogue window.

 

Load history to private dialogues

The same thing, if you need a clear window without previous messages when opening a private dialogue, then disable this option.