[X2Go-User] (Auto) grab keyboard using Windows client and Linux server

I am looking for an option to enable/disable or on mouse click have the X2go windows client grab the keyboard so that all further keystrokes including Alt - Tab combinations would be responded by the remote server.  Noticed an issue ((Auto) grab keyboard · Issue #384 · ArcticaProject/nx-libs) logged for this issue that seems to have the fixes committed in Aug 2017. Unable to find any configuration to enable this in the latest X2go client (v 4.1.1.1) downloaded from download:start [X2Go - everywhere@home] Any ideas? Any one got this working?