window lastlog_level [<levels>]

This works similarly to window level, except the levels specified determine what the client will save to its lastlog buffer for that window. If no level is specified, the current setting for the window is displayed.

The list of levels to use may be any of those allowed for window level. A comma-delimited list may be used to specify more than one level at once.

To only remember private messages and notices for the current window:

/window lastlog_level msg,notice