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Change Display Labels for Dataset Fields and Values
You can change the field labels for dimensions, derived dimensions, measures, and
derived measures. You can’t change date field labels. You can also change the display labels for
values in dimension and derived dimensions. The label doesn’t change the underlying data stored
in the dataset or the API names of the fields. The change only affects the appearance in the UI.
This chart shows the field names and values as they are stored in the dataset. 
The bold text in this XMD snippet shows how to change the labels for the field and its
values.
Here’s how it looks in the chart.