Hi Klom,
Currently we haven’t supported changing the legend label yet. However, we have already added your case into our product backlog, and will let you know when there is any further update on it.
For a workaround, we recommend you to create a custom dimension in Data Modeling and use CASE WHEN to change the label.
For example:
CASE WHEN {field} = ‘S’ then ‘Short’
ELSE ‘Long’
END.
Feel free to let us know if you need further support.
Thank you for using Holistics!