To display CIE XYZ values, ensure that you have activated XYZ display at: Configuration > Color Options... > Active Functions. Active functions will have a '>' in front; ie., "> XYZ". You may activate or disable functions by pressing the enter key.
Back in measurement mode (QA or Analyze or Compare) you can then use the up and down arrows, to mark L*a*b*. Once you have got this selection you can toggle between your active functions until you display shows the XYZ values.