Hi Jamal,

There is no setting to make that the default and, if you apply Ctrl-Shift-Space to a citation, it will revert to standard spaces when you update the fields in the document. If you need to keep a citation all one one line, you could select the citation, press Ctrl-F9 to embed it in a new field (ie { 'Citation' }), edit the field so that you get {MACROBUTTON NoMacro 'Citation'}, then press F9 to update.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]