I did some research and the solution did not work as I expected. Finally I found my mistake.
To set the property in the plugin_customization.ini file, I tried:
org.eclipse.ui.IWorkbenchPreferenceConstants.SHOW_OTHER_IN_PERSPECTIVE_MENU=false
but this is not the correct notation !!! Please see the correct solution, which I finally added to the plugin_customization.xml file
org.eclipse.ui/SHOW_OTHER_IN_PERSPECTIVE_MENU=false
Thus, the name of an interface or class that defines a property is not part of the notation!
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