Shoutbox

There's 2 possibilities for that in WLM:

First shows how to group them together (you will have a group "offline" wich you can close), second hides them even more but you will still have a group called "offline" wich is empty if you group offlines together (ticking these sorting options also means that that group will be created). If you tell it to sort on status or untick that sorting option, then this group will not exist.