It's the same for Basic or Pro,

One thing you can do is shut down Limewire and when you restart it the history will be erased.

The other thing is with limewire open go to Tools>Options>View>Autocompletion> then untick the box that says "Enable autocompletion of Text Fields" then click apply. And that will make it so it doesn't show the history

__________________
If it ain't broke, fix it till it is!