Hello,
When you are using a histogram, since you are only using one field in the “Value” the default operation is a count and you cannot change the format.
The X-axis is what changes when you select the format (percentage, number, etc.).
If you are trying to get the percentage of a vale in Y-Axis I would suggest you to use the Vertical-Bar chart.
Let me know what is exactly your use case to provide additional feedback.
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