I have already deleted the entry for F11-fullscreen from ~/.config/openbox/lubuntu-rc.xml
even after a reboot, the F11 fullscreen functionality remains, and I can't use F11 in other applications as the key press is intercepted.
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I think just deleting the lines for
F11 may not serve the purpose.
You need to replace the contents after
action name= to nothing.
action name="ToggleFullscreen" to
action name="", save the file, and then run
openbox --reconfigure in a terminal. There should be no error message if your
lubuntu-rc.xml is in good condition! There's no need to reboot. Now,
F11 should have no effect as far as Openbox is concerned.
I don't know about your other programs which also want to use
F11 for something else. For example, both Firefox and Google Chrome will still use
F11 to toggle full screen. On the other hand,
F11 in LibreOffice will now function to open the "Style and Formatting" panel.