[libreoffice-users] Ctrl+F4 Close document

Good evening
I just noticed something. I have LibreOffice 4.2.4.2 on some Windows
machines and recently also on two Linux (xubuntu 14.04) machines.
Usually on the Windows machines the KB shortcut Ctrl+F4 closes the
current document.
Under Linux it does not do that (I copied the user profile from the
Windows machine, following a tip here on the list).

Under "Tools -> Customize -> Keyboard" the item "Ctrl + F4" is greyed
out, both under Windows and Linux,
and I CAN NOT edit/modify it.

Am I missing something here?
How can I assign the "close document" function to the above key combination?

Thank you.
Thomas





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